All assignees
778 prefixes in 423 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 423-400 | CHATTNOOGA | 7473 | — | Yes |
| 423-401 | SODDYDAISY | 829J | — | Yes |
| 423-402 | CHATTNOOGA | 124F | 2008-06-20 | Yes |
| 423-403 | SO PITTSBG | 124F | 2017-05-01 | Yes |
| 423-404 | MADISONVL | 6214 | — | Yes |
| 423-405 | ATHENS | 7476 | 2011-03-29 | Yes |
| 423-406 | MIDWAY SUL | 318J | 2008-03-13 | Yes |
| 423-407 | SPRINGCITY | 204G | 2020-01-10 | Yes |
| 423-408 | KINGSPORT | 114F | 2009-10-29 | Yes |
| 423-409 | BULLS GAP | 6630 | — | — |
| 423-410 | JOHNSON CY | 4510 | — | — |
| 423-411 | XXXXXXXXXX | MULT | — | — |
| 423-412 | JOHNSON CY | 6630 | — | — |
| 423-413 | CHATTNOOGA | 6673 | — | — |
| 423-414 | CHATTNOOGA | 967F | 2010-04-01 | Yes |
| 423-415 | NEWPORT | 6673 | 2010-03-11 | Yes |
| 423-416 | MIDWAY SUL | 6673 | — | — |
| 423-417 | CHATTNOOGA | 7278 | 2017-08-23 | Yes |
| 423-418 | MIDWAY SUL | 6673 | — | Yes |
| 423-419 | CUMBERLDGP | 6673 | 2012-02-21 | Yes |
| 423-420 | MADISONVL | 9419 | — | Yes |
| 423-421 | CHATTNOOGA | 5562 | — | Yes |
| 423-422 | MOSHEIM | 4510 | — | Yes |
| 423-423 | LIMESTONE | 792K | 2025-10-16 | Yes |
| 423-424 | CHATTNOOGA | 829J | — | Yes |
| 423-425 | CHATTNOOGA | 9419 | 2001-12-11 | Yes |
| 423-426 | LIMESTONE | 6673 | 2002-03-05 | Yes |
| 423-427 | JOHNSON CY | 525E | 2018-03-05 | Yes |
| 423-428 | DAYTON | 829J | 2002-04-22 | Yes |
| 423-429 | KINGSPORT | 6214 | 2008-01-21 | Yes |
| 423-430 | JOHNSON CY | 551G | 2013-03-11 | Yes |
| 423-431 | JOHNSON CY | 4510 | — | Yes |
| 423-432 | CHATTNOOGA | 7473 | — | Yes |
| 423-433 | JOHNSON CY | 4510 | — | Yes |
| 423-434 | JOHNSON CY | 4510 | — | — |
| 423-435 | ATHENS | 4806 | 2002-05-02 | Yes |
| 423-436 | MADISONVL | 4806 | 2002-05-02 | Yes |
| 423-437 | LAFOLLETTE | 4806 | 2002-05-02 | Yes |
| 423-438 | MORRISTOWN | 4806 | 2002-05-02 | Yes |
| 423-439 | JOHNSON CY | 4510 | — | Yes |
| 423-440 | ELIZABTHTN | 6673 | 2009-10-14 | Yes |
| 423-441 | CUMBERLDGP | 365C | 2003-01-07 | Yes |
| 423-442 | MADISONVL | 9419 | — | — |
| 423-443 | CHATTNOOGA | 4806 | 2002-05-07 | Yes |
| 423-444 | LIMESTONE | 6673 | 2010-01-08 | Yes |
| 423-445 | SURGOINSVL | 516C | 2002-06-25 | Yes |
| 423-446 | FALLBRANCH | 124F | — | Yes |
| 423-447 | PIKEVILLE | 0554 | — | — |
| 423-448 | PIKEVILLE | 6214 | 2009-09-23 | — |
| 423-449 | LAFOLLETTE | 829J | 2002-06-13 | Yes |
| 423-450 | MOSHEIM | 318J | 2008-10-23 | — |
| 423-451 | SODDYDAISY | 9419 | — | Yes |
| 423-452 | SPRINGCITY | 9419 | — | Yes |
| 423-453 | ATHENS | 4806 | 2002-06-18 | Yes |
| 423-454 | DECATUR | 4806 | 2004-10-26 | Yes |
| 423-455 | JELLICO | 4806 | 2002-10-07 | Yes |
| 423-456 | LAFOLLETTE | 073H | — | Yes |
| 423-457 | CLEVELAND | 6673 | 2008-11-13 | Yes |
| 423-458 | CLEVELAND | 6214 | 2012-04-02 | Yes |
| 423-459 | CHATTNOOGA | 114F | 2018-01-16 | Yes |
| 423-460 | MOUNTAINCY | 124F | 2010-09-02 | Yes |
| 423-461 | JOHNSON CY | 4510 | — | Yes |
| 423-462 | RICEVILLE | 0578 | — | Yes |
| 423-463 | CHATTNOOGA | 9419 | 2006-09-07 | Yes |
| 423-464 | CLEVELAND | 7473 | 2009-02-27 | Yes |
| 423-465 | NEWPORT | 6214 | 2005-07-01 | Yes |
| 423-466 | ATHENS | 7476 | 2017-10-25 | Yes |
| 423-467 | MIDWAY | 4510 | — | Yes |
| 423-468 | CHATTNOOGA | 525E | — | Yes |
| 423-469 | NEWPORT | 6630 | — | — |
| 423-470 | GREENEVL | 6673 | 2003-07-28 | Yes |
| 423-471 | MOUNTAINCY | 6214 | 2003-07-28 | Yes |
| 423-472 | CLEVELAND | 9419 | — | — |
| 423-473 | CLEVELAND | 9419 | — | Yes |
| 423-474 | STONEY CRK | 4510 | — | — |
| 423-475 | CHATTNOOGA | 7473 | 2007-11-06 | Yes |
| 423-476 | CLEVELAND | 9419 | — | — |
| 423-477 | MIDWAY | 4510 | — | — |
| 423-478 | CLEVELAND | 9419 | — | — |
| 423-479 | CLEVELAND | 9419 | — | — |
| 423-480 | KINGSPORT | 6673 | 2012-02-10 | Yes |
| 423-481 | ROAN MT | 124F | 2011-09-01 | Yes |
| 423-482 | BLOUNTVL | 4806 | 2002-06-07 | Yes |
| 423-483 | JOHNSON CY | 6673 | 2002-06-07 | Yes |
| 423-484 | BRISTOL | 4806 | 2002-06-07 | Yes |
| 423-485 | CHATTNOOGA | 9419 | — | Yes |
| 423-486 | CHATTNOOGA | 6673 | 2010-06-09 | Yes |
| 423-487 | NEWPORT | 9419 | — | Yes |
| 423-488 | CHATTNOOGA | 6214 | — | — |
| 423-489 | CUMBERLDGP | 6214 | 2004-11-02 | Yes |
| 423-490 | CHATTNOOGA | 9419 | — | Yes |
| 423-491 | JOHNSON CY | 508J | 2013-06-21 | Yes |
| 423-492 | MORRISTOWN | 9419 | 2011-04-07 | Yes |
| 423-493 | CHATTNOOGA | 9419 | — | Yes |
| 423-494 | LAFOLLETTE | 6673 | 2003-02-04 | — |
| 423-495 | CHATTNOOGA | 9419 | — | — |
| 423-496 | COPPERBSIN | 9419 | — | — |
| 423-497 | CHATTNOOGA | 5562 | 2017-02-03 | Yes |
| 423-498 | CHATTNOOGA | 4645 | 2017-02-01 | Yes |
| 423-499 | CHATTNOOGA | 9419 | — | — |
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.