All assignees
778 prefixes in 423 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 423-200 | MORRISTOWN | 4806 | 2002-07-18 | Yes |
| 423-201 | LAFOLLETTE | 4806 | 2002-07-18 | Yes |
| 423-202 | JOHNSON CY | 7278 | 2003-12-16 | Yes |
| 423-203 | CHATTNOOGA | 490J | 2022-02-03 | Yes |
| 423-204 | XXXXXXXXXX | 9419 | — | — |
| 423-205 | ETOWAH | 525E | 2016-03-09 | Yes |
| 423-206 | CHATTNOOGA | 4645 | 2018-11-30 | Yes |
| 423-207 | MIDWAY | 4806 | — | Yes |
| 423-208 | CHATTNOOGA | 6214 | 2006-11-01 | Yes |
| 423-209 | CHATTNOOGA | 9419 | — | Yes |
| 423-210 | TELLICO PL | 6278 | — | Yes |
| 423-211 | XXXXXXXXXX | MULT | — | — |
| 423-212 | BLOUNTVL | 4806 | 2002-07-18 | Yes |
| 423-213 | ELIZABTHTN | 8645 | 2001-11-07 | Yes |
| 423-214 | ENGLEWOOD | 6278 | — | Yes |
| 423-215 | ONEIDA | 6673 | 2004-12-03 | — |
| 423-216 | BENTON | 829J | 2005-04-28 | Yes |
| 423-217 | BRISTOL | 4806 | 2002-07-18 | Yes |
| 423-218 | JOHNSON CY | 4806 | 2002-07-18 | Yes |
| 423-219 | CHARLESTON | 114F | 2019-10-01 | Yes |
| 423-220 | ERWIN | 829J | 2001-04-04 | Yes |
| 423-221 | CHATTNOOGA | 6630 | — | — |
| 423-222 | PIKEVILLE | 6214 | 2022-04-21 | Yes |
| 423-223 | ONEIDA | 6214 | 2006-11-30 | Yes |
| 423-224 | KINGSPORT | 4510 | — | — |
| 423-225 | BENTON | 124F | — | Yes |
| 423-226 | CHURCHHILL | 124F | 2010-05-28 | Yes |
| 423-227 | CHATTNOOGA | 7473 | — | — |
| 423-228 | SO PITTSBG | 829J | — | Yes |
| 423-229 | KINGSPORT | 4510 | — | — |
| 423-230 | KINGSPORT | 4510 | — | — |
| 423-231 | MORRISTOWN | 6214 | — | — |
| 423-232 | JOHNSON CY | 4510 | — | — |
| 423-233 | JOHNSON CY | 6880 | — | — |
| 423-234 | BAILEYTON | 4510 | — | — |
| 423-235 | BULLS GAP | 9419 | — | Yes |
| 423-236 | APISON | 0574 | — | Yes |
| 423-237 | NEWPORT | 6214 | — | Yes |
| 423-238 | OOLTEWAH | 0574 | — | — |
| 423-239 | MIDWAY SUL | 4510 | — | — |
| 423-240 | CHATTNOOGA | 6673 | — | — |
| 423-241 | COPPERBSIN | 6673 | 2003-04-11 | Yes |
| 423-242 | CHATTNOOGA | 114F | — | Yes |
| 423-243 | SODDYDAISY | 114F | — | Yes |
| 423-244 | CLEVELAND | 114F | — | Yes |
| 423-245 | KINGSPORT | 4510 | — | — |
| 423-246 | KINGSPORT | 4510 | — | — |
| 423-247 | KINGSPORT | 4510 | — | — |
| 423-248 | NEWPORT | 6278 | — | Yes |
| 423-249 | FORK RIDGE | 9419 | — | Yes |
| 423-250 | CLEVELAND | 204G | 2017-04-27 | Yes |
| 423-251 | KINGSPORT | 5562 | 2017-01-05 | Yes |
| 423-252 | ATHENS | 829J | — | Yes |
| 423-253 | TELLICO PL | 0578 | — | Yes |
| 423-254 | MORRISTOWN | 829J | — | Yes |
| 423-255 | CHATTNOOGA | 7473 | — | Yes |
| 423-256 | CHURCHHILL | 4510 | — | Yes |
| 423-257 | LIMESTONE | 4510 | — | — |
| 423-258 | MORRISTOWN | 6214 | — | Yes |
| 423-259 | NEWTAZWELL | 6278 | 2004-04-27 | Yes |
| 423-260 | CHATTNOOGA | 6673 | 2007-08-20 | Yes |
| 423-261 | COKERCREEK | 0578 | — | Yes |
| 423-262 | JOHNSON CY | 4510 | — | Yes |
| 423-263 | ETOWAH | 9419 | — | — |
| 423-264 | VONORE | 318J | 2011-07-21 | Yes |
| 423-265 | CHATTNOOGA | 9419 | — | — |
| 423-266 | CHATTNOOGA | 9419 | — | — |
| 423-267 | CHATTNOOGA | 9419 | — | — |
| 423-268 | JOHNSON CY | 6214 | 2012-06-08 | Yes |
| 423-269 | CHATTNOOGA | 6673 | 2017-01-20 | Yes |
| 423-270 | ERWIN | 6673 | 2013-04-24 | Yes |
| 423-271 | SWEETWATER | 6673 | 2011-04-14 | Yes |
| 423-272 | ROGERSVL | 9419 | — | — |
| 423-273 | MORRISTOWN | 7476 | — | Yes |
| 423-274 | BRISTOL | 4510 | — | Yes |
| 423-275 | CHATTNOOGA | 829J | 2022-06-30 | Yes |
| 423-276 | KINGSPORT | 6214 | — | Yes |
| 423-277 | MORRISTOWN | 7476 | 2001-08-29 | Yes |
| 423-278 | GREENEVL | 4806 | — | Yes |
| 423-279 | BLOUNTVL | 4510 | — | Yes |
| 423-280 | CHATTNOOGA | 6673 | — | — |
| 423-281 | BUTLER | 792K | 2011-11-01 | Yes |
| 423-282 | JOHNSON CY | 4510 | — | — |
| 423-283 | JOHNSON CY | 4510 | — | — |
| 423-284 | CLEVELAND | 6214 | — | — |
| 423-285 | DAYTON | 6214 | — | Yes |
| 423-286 | ONEIDA | 0565 | — | — |
| 423-287 | CHATTNOOGA | 9419 | — | Yes |
| 423-288 | KINGSPORT | 4510 | — | — |
| 423-289 | MORRISTOWN | 7476 | — | Yes |
| 423-290 | CHATTNOOGA | 6673 | — | Yes |
| 423-291 | MOUNTAINCY | 8645 | 2001-08-31 | Yes |
| 423-292 | FALLBRANCH | 8645 | — | — |
| 423-293 | ROGERSVL | 7476 | 2001-08-31 | Yes |
| 423-294 | CHATTNOOGA | 4806 | 2001-04-03 | Yes |
| 423-295 | BALL PLAY | 0578 | — | Yes |
| 423-296 | CHATTNOOGA | 9419 | — | Yes |
| 423-297 | ELIZABTHTN | 4806 | — | Yes |
| 423-298 | CHATTNOOGA | 7421 | — | Yes |
| 423-299 | BENTON | 4806 | 2003-11-02 | 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.