Area code 628 prefixes
193 of the 786 possible NXX blocks are assigned in area code 628 (24.6% of capacity), spread across 14 rate centers and 33 holders. The largest holders are FRACTEL, LLC (33 blocks, 17.1%), ONVOY, LLC - CA (32 blocks, 16.6%), T-MOBILE USA, INC. (28 blocks, 14.5%). Grouped by brand, AT&T accounts for 33 blocks; brand-attributable holders cover 73% 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 2014-09-29 to 2026-06-26, with 34 blocks handed out in 2016 alone. 192 blocks (99%) 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 (330) is not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 157 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
Largest holders in 628
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| FRACTEL, LLC | – | 33 | 17.1% |
| ONVOY, LLC - CA | Onvoy | 32 | 16.6% |
| T-MOBILE USA, INC. | T-Mobile | 28 | 14.5% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 17 | 8.8% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 13 | 6.7% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 12 | 6.2% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 9 | 4.7% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | Peerless | 8 | 4.1% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 6 | 3.1% |
| PACIFIC BELL | AT&T | 3 | 1.6% |
| SONIC TELECOM, LLC - CA | – | 3 | 1.6% |
| COMMIO, LLC | – | 3 | 1.6% |
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 193 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 |
|---|---|---|---|---|---|
| 628-200 | Onvoy | SNFC JUNPR | – | yes | yes |
| 628-201 | Onvoy | SNFC CNTRL | 2015-12-01 | yes | yes |
| 628-202 | T-Mobile | BELVEDERE | 2016-04-01 | yes | yes |
| 628-203 | Onvoy | STNSN-BLNS | 2016-06-27 | yes | yes |
| 628-204 | T-Mobile | NICASIO | 2016-07-01 | yes | yes |
| 628-205 | Verizon | SNFC CNTRL | 2016-07-27 | yes | yes |
| 628-206 | AT&T | SNFC CNTRL | 2015-06-02 | yes | yes |
| 628-207 | Bandwidth | SNFC MT-EV | 2016-07-29 | yes | yes |
| 628-208 | Vonage | SNFC CNTRL | 2016-08-09 | yes | yes |
| 628-209 | Telnyx | NOVATO | 2016-12-15 | yes | yes |
| 628-210 | Peerless | INVERNESS | 2016-09-19 | yes | yes |
| 628-212 | Bandwidth | CORTEMADRA | 2016-09-20 | yes | yes |
| 628-213 | T-Mobile | SNFC CNTRL | 2016-12-01 | yes | yes |
| 628-214 | Peerless | NOVATO | 2016-09-20 | yes | yes |
| 628-215 | Bandwidth | MILLVALLEY | 2016-09-20 | yes | yes |
| 628-216 | Bandwidth | POINTREYES | 2016-09-20 | yes | yes |
| 628-217 | AT&T | SNFC CNTRL | 2016-08-22 | yes | yes |
| 628-218 | Verizon | SNFC CNTRL | 2017-06-16 | yes | yes |
| 628-219 | AT&T | SNFC MT-EV | 2017-07-27 | yes | yes |
| 628-220 | Lumen | SNFC CNTRL | 2016-02-12 | yes | yes |
| 628-221 | Lumen | SNFC CNTRL | 2015-07-14 | yes | yes |
| 628-222 | Onvoy | SNFC CNTRL | 2014-09-29 | yes | yes |
| 628-223 | AT&T | SNFC CNTRL | 2015-09-16 | yes | yes |
| 628-224 | AT&T | SNFC MT-EV | 2015-10-02 | yes | yes |
| 628-225 | Verizon | SNFC CNTRL | 2015-10-02 | yes | yes |
| 628-226 | AT&T | BELVEDERE | 2015-11-13 | yes | yes |
| 628-227 | Bandwidth | SNFC MT-EV | – | yes | yes |
| 628-228 | AT&T | SNFC CNTRL | 2016-02-18 | yes | yes |
| 628-229 | Onvoy | POINTREYES | 2016-04-29 | yes | yes |
| 628-230 | Verizon | SNFC CNTRL | 2018-01-18 | yes | yes |
| 628-231 | AT&T | SNFC CNTRL | 2015-10-27 | yes | yes |
| 628-232 | Peerless | INVERNESS | 2014-10-07 | yes | yes |
| 628-233 | AT&T | SNFC CNTRL | 2015-10-05 | yes | yes |
| 628-234 | TPx | SAN RAFAEL | 2015-03-13 | yes | yes |
| 628-235 | Lumen | SNFC CNTRL | 2015-12-01 | yes | yes |
| 628-236 | T-Mobile | NOVATO | 2016-02-04 | yes | yes |
| 628-237 | T-Mobile | SAUSALITO | 2016-03-04 | yes | yes |
| 628-238 | Peerless | IGNACIO | – | yes | yes |
| 628-239 | Bandwidth | SNFC JUNPR | 2016-07-22 | yes | yes |
| 628-240 | T-Mobile | SAN RAFAEL | 2017-09-20 | yes | yes |
| 628-241 | T-Mobile | SNFC JUNPR | 2016-07-01 | yes | yes |
| 628-242 | AT&T | SNFC CNTRL | 2015-04-10 | yes | yes |
| 628-243 | Onvoy | SAN RAFAEL | 2015-12-01 | yes | yes |
| 628-244 | Peerless | BELVEDERE | 2016-08-22 | yes | yes |
| 628-245 | Onvoy | MILLVALLEY | 2016-07-14 | yes | yes |
| 628-246 | Bandwidth | SNFC CNTRL | 2016-07-22 | yes | yes |
| 628-247 | AT&T | SNFC CNTRL | 2016-07-19 | yes | yes |
| 628-248 | AT&T | SNFC MT-EV | 2016-07-19 | yes | yes |
| 628-249 | Verizon | SNFC CNTRL | 2017-02-03 | yes | yes |
| 628-250 | Verizon | SNFC JUNPR | 2017-10-04 | yes | yes |
| 628-251 | Peerless | SNFC CNTRL | 2016-10-17 | yes | yes |
| 628-252 | T-Mobile | CORTEMADRA | 2016-07-01 | yes | yes |
| 628-253 | Bandwidth | SAN RAFAEL | 2016-07-25 | yes | yes |
| 628-254 | Bandwidth | SAUSALITO | 2016-08-23 | yes | yes |
| 628-255 | Verizon | SNFC CNTRL | 2017-02-10 | yes | yes |
| 628-256 | SONIC TELECOM, LLC - CA | SNFC MT-EV | 2016-10-17 | yes | yes |
| 628-257 | RACE TELECOMMUNICATIONS, INC. - CA | MILLVALLEY | 2016-10-28 | yes | yes |
| 628-258 | T-Mobile | NICASIO | 2017-10-19 | yes | yes |
| 628-259 | AT&T | IGNACIO | 2017-10-26 | yes | yes |
| 628-260 | AT&T | SNFC CNTRL | 2018-01-29 | yes | yes |
| 628-261 | TERRA NOVA TELECOM INC. | SAUSALITO | – | yes | yes |
| 628-262 | EXIANT COMMUNICATIONS LLC | BELVEDERE | 2018-02-23 | yes | yes |
| 628-263 | Verizon | SNFC CNTRL | 2018-05-15 | yes | yes |
| 628-264 | T-Mobile | SNFC CNTRL | 2018-12-05 | yes | yes |
| 628-265 | Bandwidth | INVERNESS | 2019-02-06 | yes | yes |
| 628-266 | Bandwidth | CORTEMADRA | 2019-03-11 | yes | yes |
| 628-267 | AT&T | SNFC CNTRL | 2019-07-24 | yes | yes |
| 628-268 | Lumen | SNFC CNTRL | 2019-08-26 | yes | yes |
| 628-269 | T-Mobile | SAN RAFAEL | 2019-09-30 | yes | yes |
| 628-270 | SONIC TELECOM, LLC - CA | SNFC MT-EV | 2018-12-11 | yes | yes |
| 628-271 | Charter | SNFC CNTRL | – | yes | yes |
| 628-272 | Onvoy | POINTREYES | 2019-10-04 | yes | yes |
| 628-273 | Lumen | SNFC CNTRL | 2018-03-27 | yes | yes |
| 628-274 | Lumen | SNFC CNTRL | 2018-03-27 | yes | yes |
| 628-275 | Lumen | SNFC CNTRL | 2018-03-27 | yes | yes |
| 628-276 | T-Mobile | SNFC CNTRL | 2021-01-11 | yes | yes |
| 628-277 | Telnyx | SAN RAFAEL | 2021-01-29 | yes | yes |
| 628-278 | AT&T | SNFC MT-EV | 2022-01-10 | yes | yes |
| 628-279 | Bandwidth | SAUSALITO | 2021-11-05 | yes | yes |
| 628-280 | SONIC TELECOM, LLC - CA | SNFC MT-EV | 2018-05-01 | yes | yes |
| 628-281 | NUSO, LLC | SNFC CNTRL | 2023-01-11 | yes | yes |
| 628-282 | AT&T | SNFC JUNPR | – | yes | yes |
| 628-283 | T-Mobile | SNFC MT-EV | 2022-01-07 | yes | yes |
| 628-284 | Verizon | SNFC CNTRL | 2022-06-17 | yes | yes |
| 628-285 | Onvoy | SAN RAFAEL | 2022-08-30 | yes | yes |
| 628-286 | WIDE VOICE, LLC - CA | SNFC MT-EV | 2020-02-03 | yes | yes |
| 628-287 | FIVE9, INC. | SNFC CNTRL | 2023-04-07 | yes | yes |
| 628-288 | FRACTEL, LLC | MILLVALLEY | 2019-03-19 | yes | yes |
| 628-289 | FIVE9, INC. | SNFC CNTRL | 2023-05-26 | yes | yes |
| 628-290 | T-Mobile | SNFC JUNPR | 2023-07-13 | yes | yes |
| 628-291 | VoIP Innovations | MILLVALLEY | 2023-08-04 | yes | yes |
| 628-292 | COMMIO, LLC | BELVEDERE | 2023-08-09 | yes | yes |
| 628-293 | COMMIO, LLC | NICASIO | 2023-08-09 | yes | yes |
| 628-294 | AT&T | NOVATO | 2023-09-13 | yes | yes |
| 628-295 | Onvoy | SAN RAFAEL | 2023-09-19 | yes | yes |
| 628-296 | Onvoy | SNFC MT-EV | 2023-10-02 | yes | yes |
| 628-297 | T-Mobile | SNFC MT-EV | 2024-02-21 | yes | yes |
| 628-298 | T-Mobile | SNFC JUNPR | 2024-02-29 | yes | yes |
| 628-299 | FRACTEL, LLC | SNFC JUNPR | 2021-07-08 | yes | yes |
| 628-300 | Onvoy | SNFC CNTRL | 2015-03-17 | yes | yes |
| 628-301 | T-Mobile | NOVATO | 2024-03-06 | yes | yes |
| 628-302 | T-Mobile | CORTEMADRA | 2024-03-06 | yes | yes |
| 628-303 | Onvoy | SNFC CNTRL | 2024-03-18 | yes | yes |
| 628-304 | T-Mobile | SNFC JUNPR | 2024-05-01 | yes | yes |
| 628-305 | T-Mobile | SAN RAFAEL | 2024-05-22 | yes | yes |
| 628-306 | T-Mobile | SNFC CNTRL | 2024-05-31 | yes | yes |
| 628-307 | AT&T | IGNACIO | 2024-06-12 | yes | yes |
| 628-308 | T-Mobile | SNFC MT-EV | 2024-07-30 | yes | yes |
| 628-309 | T-Mobile | SNFC CNTRL | 2024-07-30 | yes | yes |
| 628-310 | T-Mobile | BELVEDERE | 2024-04-03 | yes | yes |
| 628-312 | T-Mobile | SNFC CNTRL | 2024-08-30 | yes | yes |
| 628-313 | T-Mobile | SAN RAFAEL | 2021-11-03 | yes | yes |
| 628-314 | SHELCOMM | SAN RAFAEL | 2024-09-12 | – | yes |
| 628-315 | T-Mobile | BELVEDERE | 2024-09-25 | yes | yes |
| 628-316 | AT&T | SNFC CNTRL | 2024-10-09 | yes | yes |
| 628-317 | AT&T | SNFC MT-EV | 2024-11-21 | yes | yes |
| 628-318 | AT&T | SNFC MT-EV | 2024-11-21 | yes | yes |
| 628-319 | AT&T | SNFC JUNPR | 2025-01-13 | yes | yes |
| 628-320 | Charter | SNFC MT-EV | 2025-01-28 | yes | yes |
| 628-321 | AT&T | SNFC CNTRL | 2022-09-15 | yes | yes |
| 628-322 | AT&T | SNFC CNTRL | 2022-09-15 | yes | yes |
| 628-323 | AT&T | SNFC CNTRL | 2022-09-15 | yes | yes |
| 628-324 | AT&T | SNFC CNTRL | 2022-09-15 | yes | yes |
| 628-325 | AT&T | SNFC CNTRL | 2022-09-15 | yes | yes |
| 628-326 | AT&T | SNFC CNTRL | 2022-09-15 | yes | yes |
| 628-327 | Onvoy | SAN RAFAEL | 2025-09-03 | yes | yes |
| 628-328 | AT&T | SNFC CNTRL | 2025-02-18 | yes | yes |
| 628-329 | T-Mobile | SAUSALITO | 2025-11-06 | yes | yes |
| 628-330 | Onvoy | SAN RAFAEL | 2026-06-26 | yes | no |
| 628-333 | Onvoy | SNFC CNTRL | – | yes | yes |
| 628-335 | AT&T | SNFC CNTRL | 2025-04-28 | yes | yes |
| 628-336 | FRACTEL, LLC | SAN RAFAEL | 2019-03-19 | yes | yes |
| 628-338 | Onvoy | SNFC MT-EV | 2023-10-16 | yes | yes |
| 628-345 | FRACTEL, LLC | POINTREYES | 2020-08-25 | yes | yes |
| 628-348 | FRACTEL, LLC | BELVEDERE | 2020-07-10 | yes | yes |
| 628-356 | FRACTEL, LLC | NICASIO | 2019-11-22 | yes | yes |
| 628-358 | T-Mobile | SNFC CNTRL | – | yes | yes |
| 628-363 | Verizon | SNFC JUNPR | 2018-03-06 | yes | yes |
| 628-377 | FRACTEL, LLC | IGNACIO | 2021-07-15 | yes | yes |
| 628-386 | FRACTEL, LLC | CORTEMADRA | 2022-05-24 | yes | yes |
| 628-388 | FRACTEL, LLC | INVERNESS | 2021-01-27 | yes | yes |
| 628-399 | FRACTEL, LLC | SNFC MT-EV | 2021-01-27 | yes | yes |
| 628-400 | Onvoy | SNFC CNTRL | 2014-10-01 | yes | yes |
| 628-432 | FRACTEL, LLC | SNFC MT-EV | 2020-09-17 | yes | yes |
| 628-433 | Bandwidth | IGNACIO | 2019-03-11 | yes | yes |
| 628-444 | Onvoy | SNFC CNTRL | 2014-09-30 | yes | yes |
| 628-465 | FRACTEL, LLC | SAUSALITO | 2019-05-20 | yes | yes |
| 628-466 | Onvoy | SNFC CNTRL | – | yes | yes |
| 628-468 | SKYE TELECOM LLC DBA SKYETEL | SNFC CNTRL | 2021-05-25 | yes | yes |
| 628-477 | FRACTEL, LLC | MILLVALLEY | 2021-02-08 | yes | yes |
| 628-488 | FRACTEL, LLC | SNFC CNTRL | 2022-02-22 | yes | yes |
| 628-500 | Onvoy | SAN RAFAEL | 2015-03-26 | yes | yes |
| 628-502 | Verizon | SNFC CNTRL | 2017-11-09 | yes | yes |
| 628-529 | FRACTEL, LLC | SNFC JUNPR | 2019-05-20 | yes | yes |
| 628-561 | Peerless | STNSN-BLNS | 2018-02-15 | yes | yes |
| 628-577 | FRACTEL, LLC | NICASIO | 2021-07-15 | yes | yes |
| 628-587 | FRACTEL, LLC | NOVATO | 2021-06-17 | yes | yes |
| 628-588 | FRACTEL, LLC | SNFC CNTRL | 2021-02-09 | yes | yes |
| 628-600 | Onvoy | SNFC CNTRL | 2014-10-01 | yes | yes |
| 628-626 | Onvoy | SNFC CNTRL | 2022-11-04 | yes | yes |
| 628-628 | FRACTEL, LLC | SNFC CNTRL | 2019-03-19 | yes | yes |
| 628-629 | HD CARRIER LLC | SNFC CNTRL | 2018-12-19 | yes | yes |
| 628-652 | AT&T | SNFC CNTRL | 2018-01-04 | yes | yes |
| 628-666 | Onvoy | IGNACIO | – | yes | yes |
| 628-667 | FRACTEL, LLC | SAN RAFAEL | 2020-11-17 | yes | yes |
| 628-677 | FRACTEL, LLC | MILLVALLEY | 2021-07-15 | yes | yes |
| 628-682 | Onvoy | NOVATO | 2020-08-27 | yes | yes |
| 628-688 | FRACTEL, LLC | SNFC CNTRL | 2020-07-10 | yes | yes |
| 628-699 | FRACTEL, LLC | SAUSALITO | 2021-07-15 | yes | yes |
| 628-724 | FRACTEL, LLC | BELVEDERE | 2020-11-16 | yes | yes |
| 628-726 | HD CARRIER LLC | SNFC CNTRL | 2024-06-20 | yes | yes |
| 628-732 | FRACTEL, LLC | SNFC JUNPR | 2020-07-10 | yes | yes |
| 628-754 | AT&T | SNFC MT-EV | 2023-02-13 | yes | yes |
| 628-758 | FRACTEL, LLC | SNFC MT-EV | 2019-03-19 | yes | yes |
| 628-766 | FRACTEL, LLC | STNSN-BLNS | 2020-07-10 | yes | yes |
| 628-777 | Onvoy | SNFC MT-EV | – | yes | yes |
| 628-786 | FRACTEL, LLC | SNFC JUNPR | 2020-11-03 | yes | yes |
| 628-788 | FRACTEL, LLC | SNFC MT-EV | 2021-02-09 | yes | yes |
| 628-789 | LEAP TELECOM, LLC | SNFC CNTRL | – | yes | yes |
| 628-800 | Onvoy | SNFC CNTRL | 2014-10-01 | yes | yes |
| 628-842 | FRACTEL, LLC | CORTEMADRA | 2020-08-25 | yes | yes |
| 628-866 | FRACTEL, LLC | BELVEDERE | 2021-07-15 | yes | yes |
| 628-867 | COMMIO, LLC | SNFC CNTRL | 2017-03-24 | yes | yes |
| 628-877 | Onvoy | CORTEMADRA | 2016-02-15 | yes | yes |
| 628-888 | Onvoy | SAN RAFAEL | – | yes | yes |
| 628-895 | Verizon | SNFC CNTRL | 2017-02-03 | yes | yes |
| 628-899 | Peerless | SNFC MT-EV | 2016-02-29 | yes | yes |
| 628-900 | Onvoy | SNFC CNTRL | – | yes | yes |
| 628-946 | FRACTEL, LLC | SNFC CNTRL | 2020-09-17 | yes | yes |
| 628-977 | FRACTEL, LLC | SNFC MT-EV | 2020-07-10 | yes | yes |
| 628-997 | Onvoy | SNFC CNTRL | 2024-04-18 | yes | yes |
| 628-998 | WAVENATION, LLC | SNFC CNTRL | 2024-03-06 | yes | yes |
| 628-999 | Onvoy | SNFC CNTRL | – | yes | yes |
Frequently asked
How many prefixes does area code 628 have?
193 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 1,930 thousand-number ranges across 14 rate centers.
What do the first three digits after 628 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 628 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 628 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 192 of 628'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