All assignees
708 prefixes in 657 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 657-200 | WESTMINSTR | 899D | 2008-08-08 | Yes |
| 657-201 | ANAHEIM | 899D | 2008-09-19 | Yes |
| 657-202 | ANAHEIM | 373F | 2009-02-11 | Yes |
| 657-203 | HUNTITNBCH | 8826 | 2010-04-14 | Yes |
| 657-204 | HUNTITNBCH | 981E | 2010-04-14 | Yes |
| 657-205 | SANTA ANA | 7240 | 2010-05-06 | Yes |
| 657-206 | GARDEN GRV | 6529 | 2010-05-18 | Yes |
| 657-207 | ANAHEIM | 899D | 2010-05-27 | Yes |
| 657-208 | ANAHEIM | 649C | 2010-09-09 | Yes |
| 657-209 | SILVERADO | 6006 | 2017-06-05 | Yes |
| 657-210 | SANTA ANA | 981E | 2010-11-11 | Yes |
| 657-211 | MULT | — | — | |
| 657-212 | SANTA ANA | 8826 | 2010-11-22 | Yes |
| 657-213 | CYPRESS | 373F | 2017-06-15 | Yes |
| 657-214 | CYPRESS | 981E | 2010-11-11 | Yes |
| 657-215 | HUNTITNBCH | 8826 | 2010-11-23 | Yes |
| 657-216 | PLACENTIA | 981E | 2011-04-04 | Yes |
| 657-217 | FULLERTON | 981E | 2011-07-18 | Yes |
| 657-218 | SANTA ANA | 793K | 2013-02-14 | Yes |
| 657-219 | SANTA ANA | 6006 | 2015-07-09 | Yes |
| 657-220 | ANAHEIM | 793K | 2013-02-14 | Yes |
| 657-221 | ORANGE | 8826 | 2013-02-11 | Yes |
| 657-222 | CYPRESS | 649C | — | Yes |
| 657-223 | ORANGE | 793K | 2013-06-13 | Yes |
| 657-224 | ORANGE | 373F | 2011-12-05 | Yes |
| 657-225 | FULLERTON | 373F | 2012-04-13 | Yes |
| 657-226 | PLACENTIA | 981E | 2014-03-03 | Yes |
| 657-227 | WESTMINSTR | 793K | 2014-04-14 | Yes |
| 657-228 | SANTA ANA | 373F | 2012-04-13 | Yes |
| 657-229 | SANTA ANA | 981E | 2010-02-23 | Yes |
| 657-230 | ANAHEIM | 8826 | 2014-08-05 | Yes |
| 657-231 | SANTA ANA | 516C | 2013-12-30 | Yes |
| 657-232 | SANTA ANA | 793K | 2013-10-18 | Yes |
| 657-233 | GARDEN GRV | 516C | 2014-01-24 | Yes |
| 657-234 | YORBALINDA | 981E | 2014-03-21 | Yes |
| 657-235 | SANTA ANA | 981E | 2011-07-22 | Yes |
| 657-236 | ORANGE | 6006 | 2014-04-11 | Yes |
| 657-237 | HUNTITNBCH | 8826 | 2014-05-07 | Yes |
| 657-238 | CYPRESS | 6529 | 2014-04-28 | Yes |
| 657-239 | BUENA PARK | 8826 | 2014-10-01 | Yes |
| 657-240 | SANTA ANA | 6006 | 2015-07-09 | Yes |
| 657-241 | HUNTITNBCH | 829J | 2013-09-16 | Yes |
| 657-242 | ANAHEIM | 8826 | 2014-04-28 | Yes |
| 657-243 | FULLERTON | 8826 | 2014-07-14 | Yes |
| 657-244 | HUNTITNBCH | 6010 | 2014-09-05 | Yes |
| 657-245 | SANTA ANA | 373F | 2012-04-13 | Yes |
| 657-246 | BREA | 6529 | 2014-09-03 | Yes |
| 657-247 | SANTA ANA | 793K | 2014-11-04 | Yes |
| 657-248 | FULLERTON | 6010 | 2014-10-14 | Yes |
| 657-249 | SANTA ANA | 6006 | 2015-07-10 | Yes |
| 657-250 | GARDEN GRV | 6006 | 2015-07-10 | Yes |
| 657-251 | GARDEN GRV | 793K | 2014-04-11 | Yes |
| 657-252 | BUENA PARK | 6529 | 2014-09-23 | Yes |
| 657-253 | FULLERTON | 6529 | 2014-10-17 | Yes |
| 657-254 | ANAHEIM | 6529 | 2014-10-16 | Yes |
| 657-255 | BUENA PARK | 649C | — | Yes |
| 657-256 | CYPRESS | 649C | — | Yes |
| 657-257 | WESTMINSTR | 6529 | 2015-09-11 | Yes |
| 657-258 | PLACENTIA | 793K | 2014-11-25 | Yes |
| 657-259 | HUNTITNBCH | 793K | 2015-08-26 | Yes |
| 657-260 | SILVERADO | 6006 | 2015-09-22 | Yes |
| 657-261 | SANTA ANA | 649C | — | Yes |
| 657-262 | ANAHEIM | 899D | 2014-12-24 | Yes |
| 657-263 | GARDEN GRV | 899D | 2015-01-09 | Yes |
| 657-264 | SANTA ANA | 6006 | 2015-03-20 | Yes |
| 657-265 | SANTA ANA | 6006 | 2015-03-20 | Yes |
| 657-266 | SANTA ANA | 6529 | 2015-05-11 | Yes |
| 657-267 | SANTA ANA | 981E | — | Yes |
| 657-268 | SANTA ANA | 6006 | 2015-07-10 | Yes |
| 657-269 | SANTA ANA | 6006 | 2010-03-05 | Yes |
| 657-270 | SANTA ANA | 6006 | 2015-10-21 | Yes |
| 657-271 | WESTMINSTR | 6529 | 2015-05-05 | Yes |
| 657-272 | ANAHEIM | 6529 | 2015-05-20 | Yes |
| 657-273 | SANTA ANA | 899D | 2015-05-04 | Yes |
| 657-274 | ORANGE | 6006 | 2015-04-14 | Yes |
| 657-275 | PLACENTIA | 6529 | 2015-07-01 | Yes |
| 657-276 | ANAHEIM | 8826 | 2015-07-29 | Yes |
| 657-277 | WESTMINSTR | 373F | 2015-11-13 | Yes |
| 657-278 | FULLERTON | 9740 | 2008-11-21 | Yes |
| 657-279 | SANTA ANA | 649C | 2015-11-23 | Yes |
| 657-280 | HUNTITNBCH | 6010 | 2015-11-13 | Yes |
| 657-281 | ORANGE | 6529 | 2015-08-05 | Yes |
| 657-282 | ORANGE | 793K | 2014-10-27 | Yes |
| 657-283 | SANTA ANA | 6006 | 2015-07-10 | Yes |
| 657-284 | ORANGE | 981E | 2015-07-30 | Yes |
| 657-285 | SANTA ANA | 6006 | 2015-08-17 | Yes |
| 657-286 | BREA | 6010 | 2015-09-11 | Yes |
| 657-287 | SILVERADO | 6006 | 2016-01-15 | Yes |
| 657-288 | WESTMINSTR | 6006 | 2015-12-07 | Yes |
| 657-289 | SANTA ANA | 8826 | 2015-12-01 | Yes |
| 657-290 | SANTA ANA | 6006 | 2016-01-25 | Yes |
| 657-291 | ORANGE | 6010 | 2015-09-11 | Yes |
| 657-292 | SANTA ANA | 6006 | 2015-08-17 | Yes |
| 657-293 | SILVERADO | 649C | 2015-08-27 | Yes |
| 657-294 | SANTA ANA | 6010 | 2015-09-11 | Yes |
| 657-295 | ANAHEIM | 8826 | 2015-10-02 | Yes |
| 657-296 | GARDEN GRV | 6529 | 2015-11-23 | Yes |
| 657-297 | SILVERADO | 649C | 2016-01-18 | Yes |
| 657-298 | CYPRESS | 6006 | 2015-12-07 | Yes |
| 657-299 | SANTA ANA | 6006 | 2016-02-10 | 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.