All assignees
778 prefixes in 423 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 423-500 | ROGERSVL | 525E | — | Yes |
| 423-501 | MOUNTAINCY | 081J | 2017-10-25 | Yes |
| 423-502 | MIDWAY SUL | 6673 | — | — |
| 423-503 | CHATTNOOGA | 7473 | — | Yes |
| 423-504 | CHATTNOOGA | 7473 | — | Yes |
| 423-505 | CHATTNOOGA | 7473 | — | Yes |
| 423-506 | ATHENS | 6673 | — | Yes |
| 423-507 | ATHENS | 9419 | — | Yes |
| 423-508 | CHATTNOOGA | 114F | — | Yes |
| 423-509 | CHATTNOOGA | 525E | 2008-10-24 | Yes |
| 423-510 | CHATTNOOGA | 9419 | — | — |
| 423-511 | XXXXXXXXXX | MULT | — | — |
| 423-512 | STONEY CRK | 6673 | 2003-08-04 | Yes |
| 423-513 | VONORE | 114F | 2022-11-08 | Yes |
| 423-514 | CHATTNOOGA | 6630 | — | — |
| 423-515 | SO PITTSBG | 525E | 2019-10-01 | Yes |
| 423-516 | SULIVNGDNS | 4510 | 2012-02-21 | Yes |
| 423-517 | CHATTNOOGA | 9419 | — | — |
| 423-518 | ELIZABTHTN | 8645 | 2012-05-24 | Yes |
| 423-519 | TELLICO PL | 6278 | — | Yes |
| 423-520 | MADISONVL | 829J | — | Yes |
| 423-521 | CHATTNOOGA | 7473 | 2008-06-10 | Yes |
| 423-522 | MORRISTOWN | 9419 | 2002-12-05 | Yes |
| 423-523 | BULLS GAP | 6673 | 2002-05-09 | Yes |
| 423-524 | JOHNSON CY | 551G | 2018-02-06 | Yes |
| 423-525 | GREENEVL | 4806 | 2008-05-14 | Yes |
| 423-526 | NEWTAZWELL | 0557 | — | Yes |
| 423-527 | SODDYDAISY | 939H | 2022-11-09 | Yes |
| 423-528 | BAILEYTON | 124F | — | Yes |
| 423-529 | GEORGETOWN | 829J | 2006-04-17 | Yes |
| 423-530 | KINGSPORT | 5562 | 2012-03-15 | Yes |
| 423-531 | CHATTNOOGA | 4645 | 2008-09-16 | Yes |
| 423-532 | NEWPORT | 829J | — | Yes |
| 423-533 | NINE MILE | 0554 | — | — |
| 423-534 | BRISTOL | 6673 | — | — |
| 423-535 | CHATTNOOGA | 7278 | 2003-07-09 | Yes |
| 423-536 | SWEETWATER | 829J | — | Yes |
| 423-537 | BULLS GAP | 829J | — | Yes |
| 423-538 | BLUFF CITY | 4510 | — | — |
| 423-539 | ONEIDA | 6214 | — | Yes |
| 423-540 | NEWPORT | 525E | — | Yes |
| 423-541 | CHATTNOOGA | 197D | 2018-03-20 | Yes |
| 423-542 | ELIZABTHTN | 4510 | — | — |
| 423-543 | ELIZABTHTN | 4510 | — | — |
| 423-544 | CHATTNOOGA | 7473 | 2001-09-14 | Yes |
| 423-545 | MADISONVL | 4806 | 2002-08-20 | Yes |
| 423-546 | BULLS GAP | 4806 | 2002-08-20 | Yes |
| 423-547 | ELIZABTHTN | 4510 | — | — |
| 423-548 | COPPERBSIN | 566D | 2005-07-11 | — |
| 423-549 | JOHNSON CY | 197D | 2018-03-23 | Yes |
| 423-550 | MIDWAY | 124F | 2023-01-25 | Yes |
| 423-551 | CHATTNOOGA | 508J | 2014-02-27 | Yes |
| 423-552 | GREENEVL | 6673 | — | Yes |
| 423-553 | CHATTNOOGA | 9419 | — | — |
| 423-554 | COLLEGESTA | 0554 | — | — |
| 423-555 | DIR ASST | MULT | — | — |
| 423-556 | SODDYDAISY | 124F | 2018-08-30 | Yes |
| 423-557 | JOHNSON CY | 8645 | 2004-09-29 | Yes |
| 423-558 | CHATTNOOGA | 525E | — | Yes |
| 423-559 | CLEVELAND | 9419 | — | — |
| 423-560 | ERWIN | 525E | 2018-08-16 | Yes |
| 423-561 | SWEETWATER | 525E | — | Yes |
| 423-562 | LAFOLLETTE | 9419 | — | — |
| 423-563 | LAFOLLETTE | 9419 | — | Yes |
| 423-564 | ROGERSVL | 6673 | 2018-05-25 | Yes |
| 423-565 | DECATUR | 124F | 2018-08-30 | Yes |
| 423-566 | LAFOLLETTE | 9419 | — | — |
| 423-567 | DAYTON | 6214 | 2008-11-26 | Yes |
| 423-568 | NIOTA | 0578 | — | Yes |
| 423-569 | ONEIDA | 0565 | — | — |
| 423-570 | DAYTON | 9419 | — | Yes |
| 423-571 | MIDWAY SUL | 6673 | — | — |
| 423-572 | ENGLEWOOD | 6278 | — | Yes |
| 423-573 | BRISTOL | 895D | 2006-07-07 | — |
| 423-574 | BLOUNTVL | 895D | 2006-07-07 | — |
| 423-575 | BLUFF CITY | 895D | 2006-07-07 | — |
| 423-576 | ELIZABTHTN | 6214 | 2023-06-15 | Yes |
| 423-577 | ONEIDA | 6214 | — | Yes |
| 423-578 | KINGSPORT | 4510 | — | Yes |
| 423-579 | KINGSPORT | 3185 | 2009-02-13 | Yes |
| 423-580 | CHATTNOOGA | 6214 | — | — |
| 423-581 | MORRISTOWN | 9419 | — | — |
| 423-582 | CHATTNOOGA | 9419 | 2009-08-10 | Yes |
| 423-583 | SULIVNGDNS | 124F | 2018-09-26 | Yes |
| 423-584 | CLEVELAND | 6214 | — | Yes |
| 423-585 | MORRISTOWN | 9419 | — | Yes |
| 423-586 | MORRISTOWN | 9419 | — | — |
| 423-587 | MORRISTOWN | 9419 | — | — |
| 423-588 | GREENEVL | 6673 | 2010-01-07 | Yes |
| 423-589 | GEORGETOWN | 6214 | 2019-04-09 | Yes |
| 423-590 | SO PITTSBG | 124F | 2019-05-03 | Yes |
| 423-591 | CHATTNOOGA | 525E | 2008-01-03 | Yes |
| 423-592 | LAFOLLETTE | 6278 | — | Yes |
| 423-593 | CHATTNOOGA | 7473 | — | Yes |
| 423-594 | DAYTON | 525E | 2009-09-16 | Yes |
| 423-595 | CHATTNOOGA | 7473 | 2001-04-12 | Yes |
| 423-596 | CHATTNOOGA | 6214 | — | — |
| 423-597 | BENTON | 124F | 2019-05-22 | Yes |
| 423-598 | CHATTNOOGA | 6214 | — | Yes |
| 423-599 | CLEVELAND | 6673 | 2010-01-07 | 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.