All assignees
778 prefixes in 423 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 423-300 | SNEEDVILLE | 6673 | 2003-04-29 | Yes |
| 423-301 | SO PITTSBG | 7278 | 2011-11-28 | Yes |
| 423-302 | JOHNSON CY | 124F | 2008-11-10 | Yes |
| 423-303 | CLEVELAND | 829J | — | Yes |
| 423-304 | CHATTNOOGA | 6214 | — | — |
| 423-305 | CHATTNOOGA | 318J | 2007-02-23 | Yes |
| 423-306 | MIDWAY SUL | 6673 | — | — |
| 423-307 | MORRISTOWN | 829J | 2005-10-24 | Yes |
| 423-308 | CHATTNOOGA | 829J | — | Yes |
| 423-309 | CHATTNOOGA | 6673 | — | — |
| 423-310 | CLEVELAND | 6214 | 2002-10-11 | — |
| 423-311 | XXXXXXXXXX | MULT | — | — |
| 423-312 | MORRISTOWN | 6673 | — | — |
| 423-313 | CHATTNOOGA | 7473 | 2001-05-09 | Yes |
| 423-314 | CHATTNOOGA | 7473 | — | — |
| 423-315 | CHATTNOOGA | 6214 | — | Yes |
| 423-316 | CHATTNOOGA | 7473 | — | — |
| 423-317 | MORRISTOWN | 9419 | — | — |
| 423-318 | MORRISTOWN | 9419 | — | Yes |
| 423-319 | HUNTSVILLE | 0565 | — | Yes |
| 423-320 | CHATTNOOGA | 6214 | — | — |
| 423-321 | CHATTNOOGA | 9419 | — | Yes |
| 423-322 | CHATTNOOGA | 6673 | — | Yes |
| 423-323 | BLOUNTVL | 4510 | — | — |
| 423-324 | PETROS | 0565 | — | — |
| 423-325 | BLOUNTVL | 4510 | — | Yes |
| 423-326 | CHATTNOOGA | 9419 | — | Yes |
| 423-327 | BULLS GAP | 6673 | — | Yes |
| 423-328 | JOHNSON CY | 318J | 2008-02-19 | Yes |
| 423-329 | GREENEVL | 6214 | 2002-03-06 | Yes |
| 423-330 | ERWIN | 6214 | 2002-03-06 | Yes |
| 423-331 | CLEVELAND | 7473 | — | Yes |
| 423-332 | SODDYDAISY | 9419 | — | — |
| 423-333 | ATHENS | 7476 | — | Yes |
| 423-334 | DECATUR | 9419 | — | Yes |
| 423-335 | MIDWAY SUL | 6673 | — | — |
| 423-336 | CHARLESTON | 9419 | — | — |
| 423-337 | SWEETWATER | 9419 | — | Yes |
| 423-338 | BENTON | 9419 | — | — |
| 423-339 | CLEVELAND | 9419 | — | Yes |
| 423-340 | BRISTOL | 8645 | — | Yes |
| 423-341 | BRISTOL | 6673 | — | — |
| 423-342 | ELIZABTHTN | 6214 | 2002-03-06 | Yes |
| 423-343 | KINGSPORT | 4510 | — | Yes |
| 423-344 | CHATTNOOGA | 9419 | — | — |
| 423-345 | SURGOINSVL | 9419 | — | Yes |
| 423-346 | WARTBURG | 0565 | — | — |
| 423-347 | ROGERSVL | 124F | — | Yes |
| 423-348 | FALLBRANCH | 4510 | — | — |
| 423-349 | SULIVNGDNS | 4510 | — | Yes |
| 423-350 | BRISTOL | 939H | 2022-07-01 | Yes |
| 423-351 | SWEETWATER | 9419 | — | Yes |
| 423-352 | LAFOLLETTE | 829J | — | Yes |
| 423-353 | MORRISTOWN | 829J | 2011-03-16 | Yes |
| 423-354 | BLOUNTVL | 4510 | — | Yes |
| 423-355 | CHATTNOOGA | 6214 | — | Yes |
| 423-356 | CHATTNOOGA | 6214 | 2001-02-28 | Yes |
| 423-357 | CHURCHHILL | 4510 | — | — |
| 423-358 | ROGERSVL | 7476 | 2002-03-07 | Yes |
| 423-359 | GREENEVL | 4510 | 2002-08-13 | — |
| 423-360 | MIDWAY SUL | 6673 | — | — |
| 423-361 | MIDWAY SUL | 6673 | — | — |
| 423-362 | CHATTNOOGA | 6214 | — | Yes |
| 423-363 | HUNTSVILLE | 6278 | 2001-02-22 | Yes |
| 423-364 | CHATTNOOGA | 6214 | — | — |
| 423-365 | SPRINGCITY | 9419 | — | — |
| 423-366 | BRISTOL | 6214 | — | Yes |
| 423-367 | KINGSPORT | 6214 | — | Yes |
| 423-368 | ATHENS | 6673 | — | Yes |
| 423-369 | OAKDALE | 0565 | — | — |
| 423-370 | ATHENS | 525E | — | Yes |
| 423-371 | SWEETWATER | 7476 | — | Yes |
| 423-372 | JELLICO | 4806 | — | Yes |
| 423-373 | BULLS GAP | 525E | — | Yes |
| 423-374 | LAFOLLETTE | 525E | — | Yes |
| 423-375 | BENTON | 516C | 2010-03-18 | Yes |
| 423-376 | MADISONVL | 525E | — | Yes |
| 423-377 | LAFOLLETTE | 6278 | — | Yes |
| 423-378 | KINGSPORT | 4510 | — | — |
| 423-379 | NEWPORT | 525E | — | Yes |
| 423-380 | CLEVELAND | 124F | — | Yes |
| 423-381 | ATHENS | 7476 | — | Yes |
| 423-382 | SNEEDVILLE | 525E | — | Yes |
| 423-383 | BRISTOL | 8645 | 2001-11-14 | — |
| 423-384 | FALLBRANCH | 8645 | 2001-11-14 | — |
| 423-385 | CHATTNOOGA | 829J | — | Yes |
| 423-386 | CHATTNOOGA | 9419 | — | Yes |
| 423-387 | BRISTOL | 6214 | 2023-06-15 | Yes |
| 423-388 | ERWIN | 8645 | 2002-03-22 | Yes |
| 423-389 | MIDWAY SUL | 6673 | 2002-05-09 | Yes |
| 423-390 | KINGSPORT | 4510 | 2002-08-13 | Yes |
| 423-391 | BLUFF CITY | 4510 | — | Yes |
| 423-392 | KINGSPORT | 4510 | — | — |
| 423-393 | BULLS GAP | 792K | — | Yes |
| 423-394 | CHATTNOOGA | 6214 | — | Yes |
| 423-395 | ATHENS | 7476 | 2022-11-04 | Yes |
| 423-396 | COLLEGEDL | 0574 | — | Yes |
| 423-397 | BENTON | 124F | 2017-07-06 | Yes |
| 423-398 | KINGSPORT | 5562 | 2011-03-01 | Yes |
| 423-399 | SULIVNGDNS | 124F | 2026-02-10 | 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.