Area code 279 prefixes
151 of the 786 possible NXX blocks are assigned in area code 279 (19.2% of capacity), spread across 16 rate centers and 25 holders. The largest holders are ONVOY, LLC - CA (38 blocks, 25.2%), FRACTEL, LLC (36 blocks, 23.8%), T-MOBILE USA, INC. (16 blocks, 10.6%). Grouped by brand, Onvoy accounts for 38 blocks; brand-attributable holders cover 65% 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 2018-01-17 to 2026-10-28, with 28 blocks handed out in 2024 alone. 151 blocks (100%) 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. 4 assigned blocks (295, 296, 298, 299) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 120 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
Largest holders in 279
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CA | Onvoy | 38 | 25.2% |
| FRACTEL, LLC | – | 36 | 23.8% |
| T-MOBILE USA, INC. | T-Mobile | 16 | 10.6% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 13 | 8.6% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 7 | 4.6% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 4 | 2.6% |
| COMMIO, LLC | – | 4 | 2.6% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 3 | 2% |
| METROPCS, INC. | T-Mobile | 3 | 2% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 3 | 2% |
| NUSO, LLC | – | 3 | 2% |
| TON80 COMMUNICATIONS, LLC | – | 3 | 2% |
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 151 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 |
|---|---|---|---|---|---|
| 279-200 | HD CARRIER LLC | SCRM MAIN | – | yes | yes |
| 279-201 | Onvoy | FAIR OAKS | 2018-08-31 | yes | yes |
| 279-202 | Lumen | FAIR OAKS | 2019-10-11 | yes | yes |
| 279-203 | AT&T | SCRM NORTH | 2020-01-10 | yes | yes |
| 279-204 | AT&T | SCRM NORTH | 2020-04-06 | yes | yes |
| 279-205 | Lumen | SCRM MAIN | 2020-04-20 | yes | yes |
| 279-206 | Bandwidth | SO PLACER | 2020-11-16 | yes | yes |
| 279-207 | T-Mobile | ELK GROVE | 2020-12-14 | yes | yes |
| 279-208 | T-Mobile | SCRM MAIN | 2021-02-22 | yes | yes |
| 279-209 | Twilio | ELK GROVE | – | yes | yes |
| 279-210 | T-Mobile | SCRM MAIN | – | yes | yes |
| 279-212 | AT&T | MICHIGNBAR | 2021-04-15 | yes | yes |
| 279-213 | Bandwidth | LINCOLN | 2021-10-01 | yes | yes |
| 279-214 | Bandwidth | FAIR OAKS | 2021-10-01 | yes | yes |
| 279-215 | Bandwidth | FOLSOM | 2021-11-22 | yes | yes |
| 279-216 | T-Mobile | SCRM MAIN | 2021-12-10 | yes | yes |
| 279-217 | Onvoy | SO PLACER | 2021-01-28 | yes | yes |
| 279-218 | TPx | SCRM NORTH | 2022-05-27 | yes | yes |
| 279-219 | Bandwidth | FOLSOM | 2022-02-11 | yes | yes |
| 279-220 | Verizon | SCRM MAIN | 2022-05-13 | yes | yes |
| 279-221 | Windstream | SCRM MAIN | 2022-06-17 | yes | yes |
| 279-222 | FRACTEL, LLC | SCRM MAIN | 2019-01-23 | yes | yes |
| 279-223 | Verizon | SCRM MAIN | 2022-01-04 | yes | yes |
| 279-224 | AT&T | SCRM MAIN | 2022-06-03 | yes | yes |
| 279-225 | Lumen | SCRM NORTH | 2022-06-29 | yes | yes |
| 279-226 | T-Mobile | RSVL MAIN | 2022-08-12 | yes | yes |
| 279-227 | Bandwidth | SO PLACER | 2022-08-25 | yes | yes |
| 279-228 | RACE TELECOMMUNICATIONS, INC. - CA | SCRM MAIN | 2022-10-03 | yes | yes |
| 279-229 | TPx | SCRM MAIN | 2022-05-26 | yes | yes |
| 279-230 | AT&T | RSVL MAIN | 2023-01-26 | yes | yes |
| 279-231 | NUSO, LLC | SCRM MAIN | – | yes | yes |
| 279-232 | COMMIO, LLC | MICHIGNBAR | 2022-11-04 | yes | yes |
| 279-233 | NUSO, LLC | SCRM NORTH | – | yes | yes |
| 279-234 | FRACTEL, LLC | SCRM MAIN | 2020-05-27 | yes | yes |
| 279-235 | T-Mobile | FOLSOM | 2022-10-20 | yes | yes |
| 279-236 | Onvoy | RSVL MAIN | 2023-04-12 | yes | yes |
| 279-237 | Onvoy | SCRM MAIN | 2023-05-19 | yes | yes |
| 279-238 | Onvoy | SCRM MAIN | 2023-06-22 | yes | yes |
| 279-239 | Onvoy | FOLSOM | 2023-06-22 | yes | yes |
| 279-240 | Onvoy | ELK GROVE | 2023-08-17 | yes | yes |
| 279-241 | T-Mobile | SCRM MAIN | 2023-08-23 | yes | yes |
| 279-242 | Onvoy | SCRM NORTH | 2023-09-19 | yes | yes |
| 279-243 | Onvoy | RSVL MAIN | 2023-09-19 | yes | yes |
| 279-244 | Onvoy | SO PLACER | 2023-09-19 | yes | yes |
| 279-245 | T-Mobile | FOLSOM | 2023-10-18 | yes | yes |
| 279-246 | T-Mobile | RIO LINDA | 2023-11-01 | yes | yes |
| 279-247 | FRACTEL, LLC | SCRM NORTH | 2021-05-19 | yes | yes |
| 279-248 | T-Mobile | SCRM MAIN | 2023-12-04 | yes | yes |
| 279-249 | T-Mobile | ELK GROVE | 2023-12-05 | yes | yes |
| 279-250 | COMMIO, LLC | SCRM NORTH | 2023-12-29 | yes | yes |
| 279-251 | COMMIO, LLC | SCRM MAIN | 2023-12-29 | yes | yes |
| 279-252 | T-Mobile | FAIR OAKS | 2024-01-10 | yes | yes |
| 279-253 | T-Mobile | RSVL MAIN | 2024-01-10 | yes | yes |
| 279-254 | T-Mobile | ELK GROVE | 2024-01-23 | yes | yes |
| 279-255 | Onvoy | SCRM MAIN | 2024-01-25 | yes | yes |
| 279-256 | Onvoy | FOLSOM | 2024-01-25 | yes | yes |
| 279-257 | T-Mobile | SCRM MAIN | 2024-02-29 | yes | yes |
| 279-258 | T-Mobile | FOLSOM | 2024-03-26 | yes | yes |
| 279-259 | Onvoy | RSVL MAIN | 2024-03-26 | yes | yes |
| 279-260 | Onvoy | SCRM MAIN | 2024-04-09 | yes | yes |
| 279-261 | ASTOUND BROADBAND, LLC - CA | SCRM NORTH | 2024-05-13 | yes | yes |
| 279-262 | Onvoy | SO PLACER | 2024-05-14 | yes | yes |
| 279-263 | Dish | RSVL CTHT | 2024-05-31 | yes | yes |
| 279-264 | Onvoy | FOLSOM | 2024-07-05 | yes | yes |
| 279-265 | AT&T | SCRM MAIN | 2024-08-20 | yes | yes |
| 279-266 | FIVE9, INC. | SCRM MAIN | 2024-09-04 | yes | yes |
| 279-267 | Bandwidth | FOLSOM | 2024-09-19 | yes | yes |
| 279-268 | LEAP TELECOM, LLC | SCRM MAIN | 2024-09-20 | yes | yes |
| 279-269 | FIVE9, INC. | SCRM NORTH | 2024-10-09 | yes | yes |
| 279-270 | NUSO, LLC | SCRM NORTH | 2024-11-08 | yes | yes |
| 279-271 | Verizon | RIO LINDA | 2024-11-12 | yes | yes |
| 279-272 | AT&T | SCRM NORTH | 2024-11-20 | yes | yes |
| 279-273 | AT&T | SCRM MAIN | 2024-11-21 | yes | yes |
| 279-274 | Onvoy | SCRM MAIN | 2024-05-20 | yes | yes |
| 279-275 | AT&T | SCRM MAIN | 2024-11-21 | yes | yes |
| 279-276 | AT&T | COURTLAND | 2024-11-22 | yes | yes |
| 279-277 | FRACTEL, LLC | RSVL CTHT | 2021-12-09 | yes | yes |
| 279-278 | Onvoy | FOLSOM | 2021-01-22 | yes | yes |
| 279-279 | Onvoy | RSVL CTHT | 2020-12-07 | yes | yes |
| 279-280 | Onvoy | SCRM NORTH | 2024-03-19 | yes | yes |
| 279-281 | AT&T | MEADOWVIEW | 2024-12-02 | yes | yes |
| 279-282 | AT&T | ELK GROVE | 2024-12-06 | yes | yes |
| 279-283 | Charter | SCRM MAIN | 2025-01-28 | yes | yes |
| 279-284 | Onvoy | SCRM NORTH | 2025-02-12 | yes | yes |
| 279-285 | AT&T | SCRM MAIN | 2025-02-18 | yes | yes |
| 279-286 | Verizon | RSVL MAIN | 2025-03-21 | yes | yes |
| 279-287 | AT&T | LINCOLN | 2025-08-20 | yes | yes |
| 279-288 | Onvoy | SCRM MAIN | 2025-10-27 | yes | yes |
| 279-289 | Onvoy | FOLSOM | 2022-09-30 | yes | yes |
| 279-290 | T-Mobile | ELK GROVE | 2025-10-30 | yes | yes |
| 279-291 | AT&T | FAIR OAKS | 2025-11-12 | yes | yes |
| 279-292 | AT&T | SCRM NORTH | 2026-04-20 | yes | yes |
| 279-293 | Onvoy | SCRM NORTH | 2026-05-21 | yes | yes |
| 279-294 | AT&T | SCRM MAIN | 2026-06-16 | yes | yes |
| 279-295 | Onvoy | SO PLACER | 2026-07-09 | yes | no |
| 279-296 | T-Mobile | SCRM MAIN | 2026-10-09 | yes | no |
| 279-297 | Onvoy | ELK GROVE | 2023-03-22 | yes | yes |
| 279-298 | Onvoy | SCRM MAIN | 2026-10-20 | yes | no |
| 279-299 | Onvoy | ELK GROVE | 2026-10-28 | yes | no |
| 279-300 | Onvoy | SCRM MAIN | 2019-05-16 | yes | yes |
| 279-321 | Onvoy | FOLSOM | – | yes | yes |
| 279-322 | FRACTEL, LLC | WALNUT GRV | 2021-07-07 | yes | yes |
| 279-333 | Onvoy | ELK GROVE | 2018-01-17 | yes | yes |
| 279-336 | FRACTEL, LLC | RSVL MAIN | 2020-11-03 | yes | yes |
| 279-345 | FRACTEL, LLC | SCRM NORTH | 2020-05-27 | yes | yes |
| 279-346 | FRACTEL, LLC | SCRM NORTH | 2020-09-17 | yes | yes |
| 279-348 | FRACTEL, LLC | SCRM MAIN | 2020-09-17 | yes | yes |
| 279-356 | FRACTEL, LLC | FOLSOM | 2020-06-01 | yes | yes |
| 279-386 | FRACTEL, LLC | SCRM MAIN | 2021-05-18 | yes | yes |
| 279-399 | Verizon | SCRM MAIN | 2018-03-19 | yes | yes |
| 279-400 | FRACTEL, LLC | LINCOLN | 2019-12-02 | yes | yes |
| 279-438 | EXIANT COMMUNICATIONS LLC | SCRM MAIN | 2026-03-30 | yes | yes |
| 279-444 | Onvoy | SCRM MAIN | 2018-01-23 | yes | yes |
| 279-465 | FRACTEL, LLC | FOLSOM | 2020-03-25 | yes | yes |
| 279-499 | FRACTEL, LLC | SCRM NORTH | 2021-07-07 | yes | yes |
| 279-500 | FRACTEL, LLC | MICHIGNBAR | 2019-12-02 | yes | yes |
| 279-529 | FRACTEL, LLC | RSVL CTHT | 2019-12-02 | yes | yes |
| 279-587 | FRACTEL, LLC | PLEASATGRV | 2021-06-17 | yes | yes |
| 279-599 | FRACTEL, LLC | SCRM MAIN | 2021-07-07 | yes | yes |
| 279-600 | FRACTEL, LLC | SCRM MAIN | 2019-12-02 | yes | yes |
| 279-666 | FRACTEL, LLC | SCRM NORTH | 2019-01-22 | yes | yes |
| 279-667 | FRACTEL, LLC | SCRM NORTH | 2021-01-04 | yes | yes |
| 279-675 | TON80 COMMUNICATIONS, LLC | RSVL MAIN | 2022-01-18 | yes | yes |
| 279-688 | FRACTEL, LLC | ISLETON | 2022-05-24 | yes | yes |
| 279-699 | FRACTEL, LLC | RIO LINDA | 2021-04-19 | yes | yes |
| 279-732 | FRACTEL, LLC | FOLSOM | 2021-02-25 | yes | yes |
| 279-737 | Onvoy | RSVL CTHT | 2023-03-23 | yes | yes |
| 279-758 | FRACTEL, LLC | SCRM NORTH | 2021-02-04 | yes | yes |
| 279-759 | FRACTEL, LLC | RIO LINDA | 2020-09-17 | yes | yes |
| 279-766 | FRACTEL, LLC | MEADOWVIEW | 2021-07-16 | yes | yes |
| 279-777 | Onvoy | SCRM NORTH | 2018-01-23 | yes | yes |
| 279-782 | TON80 COMMUNICATIONS, LLC | FAIR OAKS | 2022-01-07 | yes | yes |
| 279-786 | TON80 COMMUNICATIONS, LLC | SCRM MAIN | 2020-09-23 | yes | yes |
| 279-789 | FRACTEL, LLC | SCRM MAIN | 2022-02-18 | yes | yes |
| 279-790 | Onvoy | FAIR OAKS | 2022-11-18 | yes | yes |
| 279-799 | FRACTEL, LLC | WALNUT GRV | 2020-12-04 | yes | yes |
| 279-800 | FRACTEL, LLC | ELK GROVE | 2019-01-23 | yes | yes |
| 279-842 | FRACTEL, LLC | FOLSOM | 2020-11-03 | yes | yes |
| 279-867 | COMMIO, LLC | ELK GROVE | 2022-02-24 | yes | yes |
| 279-880 | 8x8 | SCRM MAIN | 2026-05-20 | yes | yes |
| 279-888 | Onvoy | LINCOLN | 2018-01-23 | yes | yes |
| 279-895 | Twilio | SCRM MAIN | 2020-10-05 | yes | yes |
| 279-899 | FRACTEL, LLC | COURTLAND | 2021-07-07 | yes | yes |
| 279-900 | FRACTEL, LLC | RSVL MAIN | 2019-01-23 | yes | yes |
| 279-901 | Charter | ELK GROVE | 2021-11-17 | yes | yes |
| 279-944 | T-Mobile | SCRM NORTH | 2021-12-10 | yes | yes |
| 279-946 | FRACTEL, LLC | MEADOWVIEW | 2020-09-17 | yes | yes |
| 279-966 | FRACTEL, LLC | LINCOLN | 2022-05-24 | yes | yes |
| 279-972 | Onvoy | SCRM NORTH | 2018-08-22 | yes | yes |
| 279-977 | FRACTEL, LLC | RSVL MAIN | 2021-09-15 | yes | yes |
| 279-999 | Onvoy | SO PLACER | 2018-01-23 | yes | yes |
Frequently asked
How many prefixes does area code 279 have?
151 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 1,510 thousand-number ranges across 16 rate centers.
What do the first three digits after 279 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 279 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 279 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 151 of 279'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