Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 857 prefixes
361 of the 786 possible NXX blocks are assigned in area code 857 (45.9% of capacity), spread across 21 rate centers and 41 holders. The largest holders are CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (67 blocks, 18.6%), OMNIPOINT MIAMI E LICENSE, LLC (60 blocks, 16.6%), ONVOY, LLC - MA (42 blocks, 11.6%). Grouped by brand, Verizon accounts for 93 blocks; brand-attributable holders cover 87% of the code, and the rest are CLECs, VoIP wholesalers and regional carriers that trade under their own names. The assignment records here run from 2001-03-19 to 2026-06-30, with 44 blocks handed out in 2001 alone. 354 blocks (98%) are in thousands-block pooling, meaning the block is shared between carriers in 1,000-number lots rather than held whole – which is why a single NXX can serve several carriers at once. 1 assigned block (881) is not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 186 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
361 assigned blocks of 786
21 rate centers
41 holders of record
98% in thousands-block pooling
Largest holders in 857
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | Verizon | 67 | 18.6% |
| OMNIPOINT MIAMI E LICENSE, LLC | T-Mobile | 60 | 16.6% |
| ONVOY, LLC - MA | Onvoy | 42 | 11.6% |
| METROPCS, INC. | T-Mobile | 25 | 6.9% |
| PAETEC ITEL, LLC | Windstream | 19 | 5.3% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 18 | 5% |
| VERIZON NEW ENGLAND INC. | Verizon | 13 | 3.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 13 | 3.6% |
| LEVEL 3 COMMUNICATIONS, LLC - MA | Lumen | 10 | 2.8% |
| BANDWIDTH.COM CLEC, LLC - MA | Bandwidth | 10 | 2.8% |
| COMCAST IP PHONE, LLC | Comcast | 9 | 2.5% |
| TON80 COMMUNICATIONS, LLC | – | 9 | 2.5% |
Names are printed as they appear in the assignment records, which is the legal entity rather than the brand. Holding a block is not the same as serving the numbers in it: portability moves numbers between carriers and pooling splits a block between several.
Rate centers with their own page
Rate centers where at least three blocks are assigned, excluding the numbered metro zone codes. The remainder are in the full table below.
All 361 assigned blocks
One row per NXX. “Pooled” means carriers draw 1,000-number lots from the block rather than holding all 10,000, so a pooled prefix can belong to several carriers at once. “Not in service” means assigned but not yet open for calls – a caller ID from one of those is necessarily spoofed. The holder column gives the brand where the legal entity maps to one; the full legal names are in the holders table above, exactly as NANPA records them.
| Prefix | Holder of record | Rate center | Assigned | Pooled | In service |
|---|---|---|---|---|---|
| 857-200 | Verizon | BOSTON | 2011-01-10 | yes | yes |
| 857-201 | T-Mobile | WINTHROP | 2002-10-28 | yes | yes |
| 857-202 | Verizon | BOSTON | 2011-11-10 | yes | yes |
| 857-203 | Verizon | JAMAICA PL | 2005-02-28 | yes | yes |
| 857-204 | T-Mobile | BOSTON | 2001-03-20 | yes | yes |
| 857-205 | AT&T | BOSTON | 2001-03-19 | – | yes |
| 857-206 | Verizon | BOSTON | 2011-10-07 | yes | yes |
| 857-207 | Verizon | BOSTON | 2007-04-11 | yes | yes |
| 857-208 | Verizon | BOSTON | 2012-02-08 | yes | yes |
| 857-209 | Lumen | CAMBRIDGE | 2001-10-11 | yes | yes |
| 857-210 | T-Mobile | BOSTON | 2011-03-10 | yes | yes |
| 857-212 | T-Mobile | DORCHESTER | 2001-04-23 | yes | yes |
| 857-213 | Windstream | BOSTON | 2011-10-03 | yes | yes |
| 857-214 | Verizon | BOSTON | 2011-12-06 | yes | yes |
| 857-215 | Verizon | BROOKLINE | 2010-02-23 | yes | yes |
| 857-216 | YMAX COMMUNICATIONS CORP. - MA | NEWTON | 2009-11-03 | yes | yes |
| 857-217 | T-Mobile | DORCHESTER | 2001-06-29 | yes | yes |
| 857-218 | Verizon | BROOKLINE | 2007-01-12 | yes | yes |
| 857-219 | Onvoy | NEWTON | 2012-02-16 | yes | yes |
| 857-220 | Windstream | DORCHESTER | 2001-03-20 | yes | yes |
| 857-221 | T-Mobile | BOSTON | 2005-05-25 | yes | yes |
| 857-222 | T-Mobile | BOSTON | 2001-05-17 | – | yes |
| 857-223 | Windstream | BOSTON | – | yes | yes |
| 857-224 | Verizon | BOSTON | 2009-12-17 | yes | yes |
| 857-225 | Verizon | BROOKLINE | 2001-05-03 | yes | yes |
| 857-226 | TPx | NEWTON | 2006-03-30 | yes | yes |
| 857-227 | Verizon | SOMERVILLE | 2001-05-23 | yes | yes |
| 857-228 | Windstream | WATERTOWN | 2001-07-12 | yes | yes |
| 857-229 | Windstream | NEWTON | – | yes | yes |
| 857-230 | T-Mobile | ROXBURY | 2009-04-15 | yes | yes |
| 857-231 | T-Mobile | NEWTON | 2002-07-30 | yes | yes |
| 857-232 | Onvoy | NEWTON | 2006-05-17 | yes | yes |
| 857-233 | T-Mobile | BOSTON | 2006-02-16 | yes | yes |
| 857-234 | T-Mobile | BROOKLINE | 2002-03-18 | yes | yes |
| 857-235 | Verizon | CAMBRIDGE | 2008-11-18 | yes | yes |
| 857-236 | T-Mobile | BOSTON | 2008-08-04 | yes | yes |
| 857-237 | T-Mobile | BOSTON | 2009-06-08 | yes | yes |
| 857-238 | Verizon | BOSTON | 2007-11-14 | yes | yes |
| 857-239 | Onvoy | BOSTON | – | yes | yes |
| 857-240 | Peerless | NEWTON | 2012-02-28 | yes | yes |
| 857-241 | Lumen | BOSTON | 2006-10-24 | yes | yes |
| 857-242 | TPx | CAMBRIDGE | 2011-09-08 | yes | yes |
| 857-243 | Onvoy | BOSTON | 2009-11-05 | yes | yes |
| 857-244 | Bandwidth | BOSTON | 2008-06-10 | yes | yes |
| 857-245 | YMAX COMMUNICATIONS CORP. - MA | BROOKLINE | 2006-11-02 | yes | yes |
| 857-246 | T-Mobile | BOSTON | – | yes | yes |
| 857-247 | T-Mobile | BOSTON | 2009-06-08 | yes | yes |
| 857-248 | Verizon | BOSTON | 2012-03-08 | yes | yes |
| 857-249 | T-Mobile | BOSTON | 2008-08-04 | yes | yes |
| 857-250 | T-Mobile | BOSTON | 2011-07-15 | yes | yes |
| 857-251 | T-Mobile | BOSTON | 2008-08-04 | yes | yes |
| 857-252 | Windstream | QUINCY | 2001-04-23 | yes | yes |
| 857-253 | Windstream | CAMBRIDGE | 2001-04-23 | yes | yes |
| 857-254 | Windstream | BOSTON | 2001-04-23 | yes | yes |
| 857-255 | Windstream | NEWTON | 2001-04-23 | yes | yes |
| 857-256 | Peerless | EASTBOSTON | 2011-11-24 | yes | yes |
| 857-257 | T-Mobile | SO BOSTON | 2001-04-20 | yes | yes |
| 857-258 | T-Mobile | BOSTON | 2010-06-25 | yes | yes |
| 857-259 | AT&T | CAMBRIDGE | 2011-05-24 | yes | yes |
| 857-260 | Verizon | BOSTON | 2012-03-08 | yes | yes |
| 857-261 | T-Mobile | BOSTON | 2011-02-22 | yes | yes |
| 857-262 | Verizon | BOSTON | 2015-09-03 | yes | yes |
| 857-263 | Verizon | BOSTON | 2011-07-12 | yes | yes |
| 857-264 | T-Mobile | BOSTON | 2010-09-21 | yes | yes |
| 857-265 | AT&T | BOSTON | 2011-07-12 | yes | yes |
| 857-266 | T-Mobile | BOSTON | 2010-06-10 | yes | yes |
| 857-267 | Comcast | MILTON | 2013-07-15 | yes | yes |
| 857-268 | Verizon | BOSTON | 2011-09-08 | yes | yes |
| 857-269 | Peerless | ROXBURY | 2013-04-24 | yes | yes |
| 857-270 | Verizon | CAMBRIDGE | 2014-09-30 | yes | yes |
| 857-271 | Onvoy | DORCHESTER | – | yes | yes |
| 857-272 | AT&T | BOSTON | 2006-03-01 | yes | yes |
| 857-273 | Comcast | JAMAICA PL | 2013-04-23 | yes | yes |
| 857-274 | Verizon | BOSTON | 2016-01-29 | yes | yes |
| 857-275 | Verizon | BOSTON | 2015-07-01 | yes | yes |
| 857-276 | Verizon | BOSTON | 2015-08-17 | yes | yes |
| 857-277 | T-Mobile | BOSTON | 2006-01-03 | yes | yes |
| 857-278 | Verizon | BOSTON | 2015-07-01 | yes | yes |
| 857-279 | Verizon | NEWTON | 2016-01-29 | yes | yes |
| 857-280 | Onvoy | BRIGHTON | 2016-02-26 | yes | yes |
| 857-281 | Verizon | QUINCY | 2020-08-19 | yes | yes |
| 857-282 | Verizon | BOSTON | 2015-11-04 | yes | yes |
| 857-283 | Verizon | BOSTON | 2017-04-27 | yes | yes |
| 857-284 | T-Mobile | BOSTON | 2008-01-15 | yes | yes |
| 857-285 | Windstream | CAMBRIDGE | 2012-08-16 | yes | yes |
| 857-286 | Verizon | BOSTON | 2017-04-28 | yes | yes |
| 857-287 | T-Mobile | BOSTON | 2017-01-31 | yes | yes |
| 857-288 | Verizon | BOSTON | 2006-08-01 | yes | yes |
| 857-289 | Onvoy | BOSTON | 2017-05-01 | yes | yes |
| 857-290 | Verizon | NEWTON | 2017-05-16 | yes | yes |
| 857-291 | Verizon | BOSTON | 2017-08-07 | yes | yes |
| 857-292 | Verizon | BOSTON | 2017-08-08 | yes | yes |
| 857-293 | Windstream | EASTBOSTON | 2010-02-15 | yes | yes |
| 857-294 | Verizon | BOSTON | 2007-05-11 | yes | yes |
| 857-295 | Verizon | BOSTON | 2017-08-08 | yes | yes |
| 857-296 | Lumen | BOSTON | 2017-08-16 | yes | yes |
| 857-297 | Comcast | NEWTON | 2017-08-22 | yes | yes |
| 857-298 | Charter | CAMBRIDGE | 2017-09-22 | yes | yes |
| 857-299 | Onvoy | BELMONT | – | yes | yes |
| 857-300 | Verizon | BOSTON | 2010-10-08 | yes | yes |
| 857-301 | Verizon | BOSTON | 2012-12-06 | yes | yes |
| 857-302 | AIRUS, INC. - MA | BOSTON | 2014-08-04 | yes | yes |
| 857-303 | Verizon | BOSTON | 2012-11-08 | yes | yes |
| 857-304 | AT&T | WATERTOWN | 2013-03-13 | yes | yes |
| 857-305 | Lumen | BOSTON | 2013-07-19 | yes | yes |
| 857-306 | Lumen | BOSTON | 2017-10-17 | yes | yes |
| 857-307 | Verizon | BROOKLINE | 2006-02-10 | yes | yes |
| 857-308 | T-Mobile | ROXBURY | 2014-09-16 | yes | yes |
| 857-309 | Onvoy | DORCHESTER | 2014-12-16 | yes | yes |
| 857-310 | T-Mobile | BOSTON | 2014-10-14 | yes | yes |
| 857-312 | T-Mobile | BOSTON | 2008-08-04 | yes | yes |
| 857-313 | T-Mobile | BOSTON | 2012-10-23 | yes | yes |
| 857-314 | Bandwidth | MILTON | 2015-01-28 | yes | yes |
| 857-315 | Lumen | BOSTON | 2017-10-17 | yes | yes |
| 857-316 | T-Mobile | BRIGHTON | 2015-02-27 | yes | yes |
| 857-317 | Lumen | BOSTON | 2013-03-07 | yes | yes |
| 857-318 | Verizon | BOSTON | 2007-10-17 | yes | yes |
| 857-319 | Verizon | BOSTON | 2015-06-04 | yes | yes |
| 857-320 | T-Mobile | CAMBRIDGE | 2014-10-14 | yes | yes |
| 857-321 | Verizon | BOSTON | 2011-03-10 | yes | yes |
| 857-322 | Comcast | EASTBOSTON | 2017-10-27 | yes | yes |
| 857-323 | Verizon | CHELSEA | 2013-01-22 | yes | yes |
| 857-324 | Verizon | BOSTON | 2017-12-06 | yes | yes |
| 857-325 | Verizon | NEWTON | 2015-03-31 | yes | yes |
| 857-326 | Verizon | BOSTON | 2017-12-06 | yes | yes |
| 857-327 | Verizon | BOSTON | 2015-02-02 | yes | yes |
| 857-328 | VoIP Innovations | BOSTON | 2019-06-25 | yes | yes |
| 857-329 | Verizon | BOSTON | 2017-12-29 | yes | yes |
| 857-330 | Verizon | BOSTON | 2014-10-01 | yes | yes |
| 857-331 | Verizon | CAMBRIDGE | 2015-07-22 | yes | yes |
| 857-332 | Verizon | BOSTON | 2018-01-15 | yes | yes |
| 857-333 | T-Mobile | BOSTON | 2010-11-09 | yes | yes |
| 857-334 | T-Mobile | BOSTON | 2006-09-20 | yes | yes |
| 857-335 | CSC WIRELESS, LLC | BOSTON | 2019-06-06 | yes | yes |
| 857-336 | Onvoy | WINTHROP | 2016-03-01 | yes | yes |
| 857-337 | Verizon | BROOKLINE | 2015-10-07 | yes | yes |
| 857-338 | AT&T | BOSTON | 2018-01-25 | yes | yes |
| 857-339 | COMMIO, LLC | ROXBURY | 2024-02-09 | yes | yes |
| 857-340 | T-Mobile | BROOKLINE | 2020-09-29 | yes | yes |
| 857-341 | Bandwidth | BELMONT | 2019-02-07 | yes | yes |
| 857-342 | Verizon | HYDE PARK | 2007-08-08 | yes | yes |
| 857-343 | Verizon | BOSTON | 2018-02-13 | yes | yes |
| 857-344 | Verizon | QUINCY | 2018-04-09 | yes | yes |
| 857-345 | Verizon | HYDE PARK | – | yes | yes |
| 857-346 | TELENGY LLC | BOSTON | 2018-05-23 | yes | yes |
| 857-347 | ADVANCED TELECOM SOLUTIONS, LLC | BOSTON | 2018-07-13 | yes | yes |
| 857-348 | AT&T | BOSTON | – | yes | yes |
| 857-349 | Bandwidth | WINTHROP | 2018-09-20 | yes | yes |
| 857-350 | Verizon | BOSTON | 2007-06-18 | yes | yes |
| 857-351 | T-Mobile | ROXBURY | 2024-05-17 | yes | yes |
| 857-352 | T-Mobile | BROOKLINE | 2015-01-22 | yes | yes |
| 857-353 | Verizon | BOSTON | 2020-01-06 | yes | yes |
| 857-354 | T-Mobile | BOSTON | 2018-11-21 | yes | yes |
| 857-355 | AIRUS, INC. - MA | EVERETT | 2019-10-07 | yes | yes |
| 857-356 | T-Mobile | BOSTON | 2019-10-11 | yes | yes |
| 857-357 | MEGAPHONE, INC. | CAMBRIDGE | 2019-12-24 | yes | yes |
| 857-358 | AT&T | QUINCY | 2020-03-23 | yes | yes |
| 857-359 | Verizon | QUINCY | 2020-03-24 | yes | yes |
| 857-360 | Verizon | BOSTON | 2015-10-07 | yes | yes |
| 857-361 | T-Mobile | BROOKLINE | – | yes | yes |
| 857-362 | Verizon | BOSTON | 2006-07-19 | yes | yes |
| 857-363 | Verizon | EVERETT | 2001-04-24 | yes | yes |
| 857-364 | Windstream | BROOKLINE | 2001-03-20 | yes | yes |
| 857-365 | NUSO, LLC | BOSTON | 2020-05-29 | yes | yes |
| 857-366 | Verizon | BOSTON | 2006-03-15 | yes | yes |
| 857-367 | AT&T | WATERTOWN | 2020-10-05 | yes | yes |
| 857-368 | Windstream | BOSTON | 2011-08-02 | yes | yes |
| 857-369 | Peerless | BOSTON | 2020-12-21 | yes | yes |
| 857-370 | T-Mobile | BROOKLINE | 2021-03-26 | yes | yes |
| 857-371 | Onvoy | WATERTOWN | – | yes | yes |
| 857-372 | Verizon | QUINCY | 2021-05-17 | yes | yes |
| 857-373 | Windstream | BELMONT | 2001-03-20 | yes | yes |
| 857-374 | Onvoy | QUINCY | 2021-06-14 | yes | yes |
| 857-375 | Onvoy | DORCHESTER | 2021-06-14 | yes | yes |
| 857-376 | T-Mobile | BROOKLINE | 2021-06-29 | yes | yes |
| 857-377 | Windstream | BOSTON | 2014-04-09 | yes | yes |
| 857-378 | Verizon | BOSTON | 2017-02-01 | yes | yes |
| 857-379 | COMMIO, LLC | ROXBURY | 2021-07-28 | yes | yes |
| 857-380 | Onvoy | EASTBOSTON | 2020-05-13 | yes | yes |
| 857-381 | T-Mobile | BROOKLINE | 2021-09-09 | yes | yes |
| 857-382 | Onvoy | EASTBOSTON | 2021-06-14 | yes | yes |
| 857-383 | AT&T | BOSTON | 2005-11-01 | yes | yes |
| 857-384 | Onvoy | BRIGHTON | 2021-07-16 | yes | yes |
| 857-385 | AT&T | DORCHESTER | 2016-06-01 | yes | yes |
| 857-386 | Verizon | CHELSEA | 2016-08-04 | yes | yes |
| 857-387 | Comcast | QUINCY | 2021-09-10 | yes | yes |
| 857-388 | COMMIO, LLC | SOMERVILLE | 2021-09-24 | yes | yes |
| 857-389 | T-Mobile | CHARLESTN | 2001-12-14 | yes | yes |
| 857-390 | T-Mobile | BROOKLINE | 2021-10-07 | yes | yes |
| 857-391 | T-Mobile | CHARLESTN | 2021-12-03 | yes | yes |
| 857-392 | Onvoy | JAMAICA PL | 2021-06-14 | yes | yes |
| 857-393 | Verizon | BOSTON | 2017-01-23 | yes | yes |
| 857-394 | Verizon | BELMONT | 2021-12-08 | yes | yes |
| 857-395 | T-Mobile | ROXBURY | 2022-01-27 | yes | yes |
| 857-396 | T-Mobile | BROOKLINE | 2022-07-28 | yes | yes |
| 857-397 | T-Mobile | ROXBURY | 2022-07-28 | yes | yes |
| 857-398 | T-Mobile | ROXBURY | 2022-09-21 | yes | yes |
| 857-399 | Bandwidth | ROXBURY | 2001-06-29 | yes | yes |
| 857-400 | Bandwidth | BOSTON | 2010-11-03 | yes | yes |
| 857-401 | Windstream | SO BOSTON | 2001-03-20 | yes | yes |
| 857-402 | HD CARRIER LLC | EASTBOSTON | – | yes | yes |
| 857-403 | Windstream | QUINCY | 2001-03-20 | yes | yes |
| 857-404 | Comcast | NEWTON | 2007-06-15 | yes | yes |
| 857-405 | T-Mobile | BROOKLINE | 2022-11-08 | yes | yes |
| 857-406 | Verizon | BOSTON | 2015-11-16 | yes | yes |
| 857-407 | AT&T | ROXBURY | 2015-06-01 | yes | yes |
| 857-408 | Verizon | BOSTON | 2015-11-25 | yes | yes |
| 857-409 | Verizon | BOSTON | 2016-09-21 | yes | yes |
| 857-410 | Bandwidth | CHARLESTN | 2016-08-12 | yes | yes |
| 857-412 | Onvoy | CAMBRIDGE | – | yes | yes |
| 857-413 | Lumen | BOSTON | 2005-09-19 | yes | yes |
| 857-414 | HD CARRIER LLC | BRIGHTON | – | yes | yes |
| 857-415 | Vonage | BOSTON | 2013-07-03 | yes | yes |
| 857-416 | TPx | BOSTON | 2022-11-17 | yes | yes |
| 857-417 | T-Mobile | BOSTON | 2008-08-04 | yes | yes |
| 857-418 | TPx | DORCHESTER | 2022-11-17 | yes | yes |
| 857-419 | AT&T | MILTON | 2016-08-08 | yes | yes |
| 857-420 | Onvoy | CAMBRIDGE | 2022-11-23 | yes | yes |
| 857-421 | T-Mobile | BROOKLINE | 2024-07-01 | yes | yes |
| 857-422 | Onvoy | SO BOSTON | 2021-06-14 | yes | yes |
| 857-423 | T-Mobile | BROOKLINE | 2019-09-12 | yes | yes |
| 857-424 | AT&T | ROXBURY | 2016-10-25 | yes | yes |
| 857-425 | AT&T | BRIGHTON | 2016-09-06 | yes | yes |
| 857-426 | T-Mobile | BROOKLINE | 2024-11-01 | yes | yes |
| 857-427 | T-Mobile | BOSTON | 2024-11-01 | yes | yes |
| 857-428 | Onvoy | EVERETT | 2023-06-09 | yes | yes |
| 857-429 | T-Mobile | ROXBURY | 2024-11-01 | yes | yes |
| 857-430 | AT&T | BOSTON | 2024-11-13 | yes | yes |
| 857-431 | WAVENATION, LLC | BOSTON | 2025-07-10 | yes | yes |
| 857-433 | SHELCOMM | BOSTON | 2026-05-04 | – | yes |
| 857-434 | SHELCOMM | CAMBRIDGE | 2026-05-04 | – | yes |
| 857-437 | T-Mobile | ROXBURY | 2019-09-12 | yes | yes |
| 857-443 | COMMIO, LLC | BOSTON | 2017-05-22 | yes | yes |
| 857-444 | Peerless | BOSTON | 2010-11-22 | yes | yes |
| 857-445 | AT&T | BOSTON | 2006-03-21 | yes | yes |
| 857-449 | Comcast | BOSTON | 2002-04-02 | – | yes |
| 857-452 | T-Mobile | CHARLESTN | – | yes | yes |
| 857-453 | Lumen | BOSTON | 2005-05-19 | yes | yes |
| 857-465 | FRACTEL, LLC | BOSTON | 2020-05-08 | yes | yes |
| 857-466 | TON80 COMMUNICATIONS, LLC | HYDE PARK | 2022-02-07 | yes | yes |
| 857-467 | TON80 COMMUNICATIONS, LLC | SOMERVILLE | 2022-02-24 | yes | yes |
| 857-468 | TON80 COMMUNICATIONS, LLC | CHARLESTN | 2022-02-11 | yes | yes |
| 857-472 | AT&T | BOSTON | 2001-12-17 | yes | yes |
| 857-475 | Onvoy | CHELSEA | 2021-04-01 | yes | yes |
| 857-477 | Onvoy | JAMAICA PL | 2016-02-10 | yes | yes |
| 857-488 | Verizon | BOSTON | 2005-09-13 | yes | yes |
| 857-491 | LIGHTPATH OF NEW ENGLAND | BOSTON | 2021-09-23 | yes | yes |
| 857-492 | T-Mobile | ROXBURY | 2002-07-30 | yes | yes |
| 857-496 | Comcast | SO BOSTON | 2004-11-17 | yes | yes |
| 857-497 | T-Mobile | CHARLESTN | 2023-08-17 | yes | yes |
| 857-498 | AT&T | BRIGHTON | 2001-08-24 | yes | yes |
| 857-499 | AT&T | QUINCY | 2001-03-29 | yes | yes |
| 857-500 | Verizon | CAMBRIDGE | 2011-04-17 | yes | yes |
| 857-504 | Lumen | BOSTON | – | yes | yes |
| 857-505 | T-Mobile | BOSTON | 2016-09-21 | yes | yes |
| 857-506 | T-Mobile | ROXBURY | 2023-10-06 | yes | yes |
| 857-507 | Verizon | BOSTON | 2016-09-21 | yes | yes |
| 857-520 | Onvoy | HYDE PARK | – | yes | yes |
| 857-523 | Verizon | SOMERVILLE | 2001-05-03 | yes | yes |
| 857-524 | Verizon | SO BOSTON | 2001-03-27 | yes | yes |
| 857-526 | T-Mobile | QUINCY | 2002-07-30 | yes | yes |
| 857-529 | Verizon | CAMBRIDGE | 2015-02-03 | yes | yes |
| 857-540 | T-Mobile | BRIGHTON | – | yes | yes |
| 857-544 | T-Mobile | ROXBURY | 2001-11-28 | yes | yes |
| 857-547 | Windstream | JAMAICA PL | 2001-03-20 | yes | yes |
| 857-550 | COMMIO, LLC | BELMONT | 2023-09-26 | yes | yes |
| 857-557 | HD CARRIER LLC | BOSTON | 2019-08-27 | yes | yes |
| 857-559 | Verizon | BRIGHTON | 2001-03-27 | yes | yes |
| 857-565 | T-Mobile | BROOKLINE | 2023-11-09 | yes | yes |
| 857-567 | Onvoy | DORCHESTER | 2020-05-15 | yes | yes |
| 857-574 | Windstream | EASTBOSTON | 2001-03-20 | yes | yes |
| 857-575 | Onvoy | SOMERVILLE | 2021-04-01 | yes | yes |
| 857-576 | Bandwidth | BROOKLINE | – | yes | yes |
| 857-577 | Onvoy | CHARLESTN | 2016-02-11 | yes | yes |
| 857-578 | Twilio | NEWTON | 2020-10-09 | yes | yes |
| 857-579 | T-Mobile | BOSTON | 2025-01-07 | yes | yes |
| 857-587 | HD CARRIER LLC | DORCHESTER | – | yes | yes |
| 857-588 | Verizon | CHARLESTN | 2001-03-27 | yes | yes |
| 857-597 | Onvoy | WINTHROP | 2021-04-01 | yes | yes |
| 857-598 | Verizon | MILTON | 2001-03-20 | yes | yes |
| 857-600 | Bandwidth | CAMBRIDGE | 2011-04-06 | yes | yes |
| 857-605 | T-Mobile | BRIGHTON | 2023-10-11 | yes | yes |
| 857-615 | T-Mobile | BOSTON | 2009-06-11 | yes | yes |
| 857-626 | Verizon | BELMONT | 2001-06-29 | yes | yes |
| 857-636 | Verizon | NEWTON | 2001-07-06 | yes | yes |
| 857-639 | TON80 COMMUNICATIONS, LLC | CAMBRIDGE | 2022-02-15 | yes | yes |
| 857-654 | T-Mobile | BOSTON | 2006-10-17 | yes | yes |
| 857-656 | T-Mobile | BOSTON | 2024-11-21 | yes | yes |
| 857-663 | Onvoy | DORCHESTER | – | yes | yes |
| 857-666 | Onvoy | BROOKLINE | 2015-03-23 | yes | yes |
| 857-675 | Onvoy | ROXBURY | 2021-04-02 | yes | yes |
| 857-678 | Onvoy | BELMONT | 2021-04-02 | yes | yes |
| 857-688 | FRACTEL, LLC | DORCHESTER | 2021-10-26 | yes | yes |
| 857-693 | TON80 COMMUNICATIONS, LLC | ROXBURY | 2022-02-15 | yes | yes |
| 857-701 | T-Mobile | ROXBURY | 2014-01-15 | yes | yes |
| 857-702 | NUSO, LLC | BOSTON | 2014-02-07 | yes | yes |
| 857-703 | Verizon | HYDE PARK | 2014-07-28 | yes | yes |
| 857-706 | Lumen | CAMBRIDGE | – | yes | yes |
| 857-707 | Verizon | BROOKLINE | 2014-10-10 | yes | yes |
| 857-719 | T-Mobile | JAMAICA PL | 2002-07-30 | yes | yes |
| 857-728 | Verizon | JAMAICA PL | 2001-03-27 | yes | yes |
| 857-737 | TON80 COMMUNICATIONS, LLC | WATERTOWN | 2022-03-22 | yes | yes |
| 857-746 | TON80 COMMUNICATIONS, LLC | BROOKLINE | 2022-02-09 | yes | yes |
| 857-753 | Verizon | BOSTON | 2005-08-09 | yes | yes |
| 857-754 | Onvoy | QUINCY | 2020-12-08 | yes | yes |
| 857-755 | FRACTEL, LLC | QUINCY | 2020-09-03 | yes | yes |
| 857-756 | METROPOLITAN TELECOMMUNICATIONS OF MASS DBA METTEL | CAMBRIDGE | 2005-07-26 | yes | yes |
| 857-757 | THE VOICE APPLICATION NETWORK, LLC | CAMBRIDGE | 2015-03-09 | yes | yes |
| 857-758 | FRACTEL, LLC | BOSTON | 2021-04-27 | yes | yes |
| 857-760 | Bandwidth | WATERTOWN | 2016-06-21 | yes | yes |
| 857-762 | T-Mobile | BOSTON | 2016-07-18 | yes | yes |
| 857-763 | T-Mobile | BOSTON | 2016-07-22 | yes | yes |
| 857-766 | FRACTEL, LLC | SO BOSTON | 2020-07-21 | yes | yes |
| 857-767 | TON80 COMMUNICATIONS, LLC | BOSTON | 2022-01-07 | yes | yes |
| 857-770 | INTRADO COMMUNICATIONS, LLC | BOSTON | 2014-12-23 | yes | yes |
| 857-772 | Verizon | BOSTON | 2016-07-27 | yes | yes |
| 857-773 | T-Mobile | JAMAICA PL | 2016-09-12 | yes | yes |
| 857-776 | Lumen | CHELSEA | 2001-06-29 | yes | yes |
| 857-777 | Peerless | CAMBRIDGE | 2012-03-05 | yes | yes |
| 857-788 | SKYE TELECOM LLC DBA SKYETEL | BOSTON | 2021-08-20 | yes | yes |
| 857-799 | HD CARRIER LLC | CAMBRIDGE | 2018-11-06 | yes | yes |
| 857-800 | Onvoy | BOSTON | 2015-03-20 | yes | yes |
| 857-810 | Onvoy | BOSTON | 2021-03-11 | yes | yes |
| 857-814 | Verizon | XXXXXXXXXX | – | – | yes |
| 857-816 | Verizon | WINTHROP | 2001-03-20 | yes | yes |
| 857-822 | Charter | SOMERVILLE | 2024-11-07 | yes | yes |
| 857-829 | T-Mobile | CAMBRIDGE | 2002-08-13 | yes | yes |
| 857-832 | TON80 COMMUNICATIONS, LLC | BRIGHTON | 2022-02-11 | yes | yes |
| 857-833 | Charter | WINTHROP | 2024-11-07 | yes | yes |
| 857-837 | Onvoy | CHARLESTN | 2020-05-28 | yes | yes |
| 857-847 | Charter | DORCHESTER | 2021-03-17 | yes | yes |
| 857-855 | Onvoy | BOSTON | 2021-01-25 | yes | yes |
| 857-856 | Onvoy | CAMBRIDGE | 2015-03-18 | yes | yes |
| 857-857 | Charter | NEWTON | 2024-11-07 | yes | yes |
| 857-858 | Onvoy | NEWTON | 2020-05-13 | yes | yes |
| 857-867 | Charter | BROOKLINE | 2021-03-17 | yes | yes |
| 857-869 | T-Mobile | BOSTON | 2007-07-23 | yes | yes |
| 857-877 | Onvoy | BRIGHTON | 2020-05-13 | yes | yes |
| 857-880 | BARR TELL USA, INC. - MA | BOSTON | 2015-11-23 | yes | yes |
| 857-881 | 8x8 | BOSTON | 2026-06-30 | yes | no |
| 857-887 | Charter | JAMAICA PL | 2020-12-18 | yes | yes |
| 857-888 | T-Mobile | EVERETT | 2002-07-30 | yes | yes |
| 857-891 | T-Mobile | BOSTON | 2001-04-02 | – | yes |
| 857-895 | Verizon | BOSTON | 2017-02-02 | yes | yes |
| 857-919 | T-Mobile | BRIGHTON | 2001-04-02 | yes | yes |
| 857-928 | T-Mobile | CAMBRIDGE | 2001-08-03 | yes | yes |
| 857-930 | T-Mobile | BOSTON | 2014-06-10 | yes | yes |
| 857-939 | Verizon | QUINCY | 2001-06-15 | yes | yes |
| 857-944 | AT&T | BOSTON | 2024-11-12 | yes | yes |
| 857-957 | WIDE VOICE, LLC - MA | BOSTON | 2014-09-30 | yes | yes |
| 857-961 | T-Mobile | BRIGHTON | 2023-01-09 | yes | yes |
| 857-971 | Onvoy | CHARLESTN | 2016-05-09 | yes | yes |
| 857-972 | Lumen | BOSTON | 2015-07-29 | yes | yes |
| 857-989 | AT&T | NEWTON | 2024-11-11 | yes | yes |
| 857-990 | EVOLVE CELLULAR, INC. | BOSTON | 2015-09-22 | yes | yes |
| 857-991 | Comcast | BOSTON | 2001-06-19 | yes | yes |
| 857-995 | Onvoy | SOMERVILLE | – | yes | yes |
| 857-996 | Verizon | BOSTON | – | yes | yes |
| 857-997 | HD CARRIER LLC | SOMERVILLE | – | yes | yes |
| 857-998 | Verizon | CAMBRIDGE | 2001-05-03 | yes | yes |
| 857-999 | Peerless | CAMBRIDGE | 2012-05-23 | yes | yes |
Frequently asked
How many prefixes does area code 857 have?
361 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 3,610 thousand-number ranges across 21 rate centers.
What do the first three digits after 857 tell me?
They identify the block, which tells you the rate center it was allocated to and the carrier that received it. They do not tell you who serves the number today: portability moves numbers between carriers, and pooling splits a block between several of them.
Is a 857 prefix tied to a specific town?
To a rate center, which is billing geography rather than a town. NANPA abbreviates rate center names to ten characters and in large metros uses zone codes, so the name is a NANPA label, not a place name.
What does “pooled” mean in the 857 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 354 of 857's blocks are pooled, which is how regulators slowed down area code exhaustion – and why one prefix can belong to several carriers.
Source and limits
NANPA CO Code Assignment Records, all states, utilized codes, file updated 11/01/2026 – the rows where the record's Use field is “AS” (assigned). Unavailable codes are excluded. The records say who received a block and when, not who serves a particular number today.
More about this code: overview · carriers · spam complaints · local time