All assignees
708 prefixes in 657 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 657-300 | HUNTITNBCH | 649C | — | Yes |
| 657-301 | HUNTITNBCH | 6006 | 2016-02-10 | Yes |
| 657-302 | WESTMINSTR | 6006 | 2016-02-26 | Yes |
| 657-303 | SANTA ANA | 6006 | 2016-03-07 | Yes |
| 657-304 | SANTA ANA | 8826 | 2016-03-07 | Yes |
| 657-305 | SANTA ANA | 6006 | 2016-03-10 | Yes |
| 657-306 | WESTMINSTR | 6006 | 2016-03-11 | Yes |
| 657-307 | SANTA ANA | 6006 | 2016-03-14 | Yes |
| 657-308 | SANTA ANA | 6006 | 2016-03-16 | Yes |
| 657-309 | SANTA ANA | 6006 | 2016-03-16 | Yes |
| 657-310 | SILVERADO | 6006 | 2017-07-10 | Yes |
| 657-311 | MULT | — | — | |
| 657-312 | HUNTITNBCH | 6006 | 2016-03-16 | Yes |
| 657-313 | SANTA ANA | 7718 | 2016-03-22 | Yes |
| 657-314 | SILVERADO | 8826 | 2017-07-24 | Yes |
| 657-315 | PLACENTIA | 516C | — | Yes |
| 657-316 | SILVERADO | 6006 | 2016-04-11 | Yes |
| 657-317 | SILVERADO | 373F | 2018-09-27 | Yes |
| 657-318 | WESTMINSTR | 6006 | 2016-04-11 | Yes |
| 657-319 | FULLERTON | 6529 | 2018-03-29 | Yes |
| 657-320 | ORANGE | 7139 | 2018-04-12 | Yes |
| 657-321 | SANTA ANA | 6529 | 2016-03-04 | Yes |
| 657-322 | SANTA ANA | 6006 | 2016-01-25 | Yes |
| 657-323 | SILVERADO | 6006 | 2017-03-20 | Yes |
| 657-324 | SANTA ANA | 6006 | 2015-12-07 | Yes |
| 657-325 | BUENA PARK | 649C | 2016-04-21 | Yes |
| 657-326 | GARDEN GRV | 0051 | 2018-05-08 | — |
| 657-327 | HUNTITNBCH | 6006 | 2016-05-12 | Yes |
| 657-328 | SANTA ANA | 7139 | 2016-05-12 | Yes |
| 657-329 | HUNTITNBCH | 793K | 2016-05-16 | Yes |
| 657-330 | FULLERTON | 373F | 2012-04-13 | Yes |
| 657-331 | ANAHEIM | 649C | — | Yes |
| 657-332 | SILVERADO | 649C | 2016-05-17 | Yes |
| 657-333 | ORANGE | 981E | — | Yes |
| 657-334 | WESTMINSTR | 6529 | 2016-06-10 | Yes |
| 657-335 | SANTA ANA | 6529 | 2016-06-17 | Yes |
| 657-336 | SANTA ANA | 6006 | — | Yes |
| 657-337 | CYPRESS | 516C | 2016-06-17 | Yes |
| 657-338 | HUNTITNBCH | 6006 | 2016-07-14 | Yes |
| 657-339 | HUNTITNBCH | 981E | 2016-08-15 | Yes |
| 657-340 | WESTMINSTR | 6529 | 2016-08-30 | Yes |
| 657-341 | BREA | 6529 | 2016-06-29 | Yes |
| 657-342 | HUNTITNBCH | 6529 | 2016-08-09 | Yes |
| 657-343 | SILVERADO | 6006 | 2016-08-26 | Yes |
| 657-344 | SILVERADO | 6006 | 2016-08-26 | Yes |
| 657-345 | YORBALINDA | 6529 | 2016-08-26 | Yes |
| 657-346 | SANTA ANA | 6529 | 2016-09-21 | Yes |
| 657-347 | ANAHEIM | 6529 | — | Yes |
| 657-348 | ORANGE | 373F | 2016-11-18 | Yes |
| 657-349 | WESTMINSTR | 6006 | 2016-11-18 | Yes |
| 657-350 | WESTMINSTR | 6006 | 2016-11-18 | Yes |
| 657-351 | SILVERADO | 6529 | 2016-11-02 | Yes |
| 657-352 | WESTMINSTR | 6010 | 2017-01-16 | Yes |
| 657-353 | SILVERADO | 6006 | 2017-02-10 | Yes |
| 657-354 | FULLERTON | 899D | 2017-04-21 | Yes |
| 657-355 | HUNTITNBCH | 6529 | 2017-12-14 | Yes |
| 657-356 | SANTA ANA | 073H | 2017-03-17 | Yes |
| 657-357 | SANTA ANA | 6529 | — | Yes |
| 657-358 | SANTA ANA | 8826 | 2017-04-27 | Yes |
| 657-359 | SILVERADO | 981E | 2018-06-12 | Yes |
| 657-360 | HUNTITNBCH | 6006 | 2018-09-11 | Yes |
| 657-361 | SILVERADO | 6006 | 2017-05-19 | Yes |
| 657-362 | ANAHEIM | 0051 | 2018-07-31 | — |
| 657-363 | YORBALINDA | 6529 | 2014-10-17 | Yes |
| 657-364 | WESTMINSTR | 6006 | — | Yes |
| 657-365 | HUNTITNBCH | 6529 | 2018-09-18 | Yes |
| 657-366 | YORBALINDA | 981E | 2018-09-25 | Yes |
| 657-367 | WESTMINSTR | 6006 | 2018-11-26 | Yes |
| 657-368 | WESTMINSTR | 6010 | 2018-12-06 | Yes |
| 657-369 | SILVERADO | 6006 | 2019-01-22 | Yes |
| 657-370 | WESTMINSTR | 6006 | 2019-02-13 | Yes |
| 657-371 | HUNTITNBCH | 6006 | 2019-02-15 | Yes |
| 657-372 | HUNTITNBCH | 6529 | 2019-02-27 | Yes |
| 657-373 | PLACENTIA | 981E | 2019-03-11 | Yes |
| 657-374 | HUNTITNBCH | 6006 | 2019-03-14 | Yes |
| 657-375 | SANTA ANA | 6529 | 2019-03-20 | Yes |
| 657-376 | WESTMINSTR | 6010 | 2019-03-21 | Yes |
| 657-377 | GARDEN GRV | 649C | 2016-03-22 | Yes |
| 657-378 | FULLERTON | 373F | 2012-04-13 | Yes |
| 657-379 | HUNTITNBCH | 6006 | 2019-04-15 | Yes |
| 657-380 | SILVERADO | 6006 | 2019-04-22 | Yes |
| 657-381 | HUNTITNBCH | 6006 | 2019-04-25 | Yes |
| 657-382 | SILVERADO | 6006 | 2019-05-21 | Yes |
| 657-383 | SANTA ANA | 373F | 2012-04-13 | Yes |
| 657-384 | WESTMINSTR | 6010 | 2019-05-28 | Yes |
| 657-385 | BUENA PARK | 6010 | 2019-06-10 | Yes |
| 657-386 | HUNTITNBCH | 6006 | 2019-06-20 | Yes |
| 657-387 | YORBALINDA | 649C | 2016-01-20 | Yes |
| 657-388 | HUNTITNBCH | 6006 | 2019-07-01 | Yes |
| 657-389 | SILVERADO | 6006 | 2019-08-12 | Yes |
| 657-390 | ORANGE | 649C | 2016-02-01 | Yes |
| 657-391 | ORANGE | 6010 | 2019-08-22 | Yes |
| 657-392 | HUNTITNBCH | 6006 | 2019-08-26 | Yes |
| 657-393 | HUNTITNBCH | 6006 | 2019-07-03 | Yes |
| 657-394 | HUNTITNBCH | 6010 | 2019-08-26 | Yes |
| 657-395 | YORBALINDA | 6010 | 2019-09-06 | Yes |
| 657-396 | HUNTITNBCH | 6006 | 2019-09-20 | Yes |
| 657-397 | SANTA ANA | 6010 | 2019-10-02 | Yes |
| 657-398 | HUNTITNBCH | 6006 | 2019-10-09 | Yes |
| 657-399 | SANTA ANA | 6006 | 2019-03-14 | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.