All assignees
799 prefixes in 631 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 631-400 | CTRMORICHS | 384C | — | Yes |
| 631-401 | BRENTWOOD | 4036 | 2020-01-13 | Yes |
| 631-402 | BRENTWOOD | 473G | 2012-02-01 | Yes |
| 631-403 | PTJEFFERSN | 7133 | 2006-08-23 | Yes |
| 631-404 | BRENTWOOD | 7421 | — | Yes |
| 631-405 | RIVERHEAD | 7133 | 2011-02-22 | Yes |
| 631-406 | SMITHTOWN | 7353 | — | Yes |
| 631-407 | SOUTHOLD | 997E | 2011-03-21 | Yes |
| 631-408 | AMITYVILLE | 6622 | 2012-02-06 | Yes |
| 631-409 | NASSAUZN09 | 515J | — | Yes |
| 631-410 | COMMACK | 829J | — | Yes |
| 631-411 | XXXXXXXXXX | MULT | — | — |
| 631-412 | LINDENHST | 7133 | — | Yes |
| 631-413 | SELDEN | 4036 | 2006-02-08 | Yes |
| 631-414 | FARMINGDL | 7126 | — | Yes |
| 631-415 | CENTRAISLP | 4006 | — | Yes |
| 631-416 | BRENTWOOD | 6959 | 2011-07-11 | Yes |
| 631-417 | BABYLON | 7126 | 2011-10-10 | Yes |
| 631-418 | HUNTINGTON | 7133 | 2001-05-03 | Yes |
| 631-419 | BAYPORT | 9104 | — | Yes |
| 631-420 | FARMINGDL | 9104 | — | Yes |
| 631-421 | HUNTINGTON | 9104 | — | — |
| 631-422 | BABYLON | 9104 | — | — |
| 631-423 | HUNTINGTON | 9104 | — | — |
| 631-424 | HUNTINGTON | 9104 | — | — |
| 631-425 | HUNTINGTON | 9104 | — | — |
| 631-426 | AMITYVILLE | 6622 | 2023-09-07 | Yes |
| 631-427 | HUNTINGTON | 9104 | — | — |
| 631-428 | RONKONKOMA | 6622 | 2001-04-04 | — |
| 631-429 | LINDENHST | 155E | 2012-09-06 | Yes |
| 631-430 | GREENPORT | 155E | 2013-04-03 | Yes |
| 631-431 | CENTRAISLP | 6622 | — | Yes |
| 631-432 | BRENTWOOD | 6959 | — | Yes |
| 631-433 | BRENTWOOD | 5562 | 2002-06-26 | Yes |
| 631-434 | BRENTWOOD | 9104 | — | Yes |
| 631-435 | BRENTWOOD | 9104 | — | Yes |
| 631-436 | BRENTWOOD | 9104 | — | Yes |
| 631-437 | FIREISLAND | 7140 | 2013-10-08 | Yes |
| 631-438 | PATCHOGUE | 997E | 2011-05-03 | Yes |
| 631-439 | CENTRAISLP | 7126 | — | — |
| 631-440 | FIREISLAND | 4006 | — | Yes |
| 631-441 | BRENTWOOD | 6630 | — | — |
| 631-442 | BRENTWOOD | 6630 | — | — |
| 631-443 | EASTPORT | 4006 | — | Yes |
| 631-444 | STONYBROOK | 9104 | — | — |
| 631-445 | BRENTWOOD | 5562 | 2001-03-15 | Yes |
| 631-446 | ISLIP | 612K | 2007-06-07 | Yes |
| 631-447 | PATCHOGUE | 9104 | — | Yes |
| 631-448 | YAPHANK | 6622 | 2011-08-10 | Yes |
| 631-449 | BRENTWOOD | 5562 | 2013-06-14 | Yes |
| 631-450 | LINDENHST | 384C | — | Yes |
| 631-451 | SELDEN | 9104 | — | — |
| 631-452 | CENTRAISLP | 6622 | 2015-09-08 | Yes |
| 631-453 | SELDEN | 9748 | — | — |
| 631-454 | FARMINGDL | 9104 | — | Yes |
| 631-455 | DEER PARK | 6622 | — | — |
| 631-456 | BRENTWOOD | 6959 | 2005-02-09 | Yes |
| 631-457 | BRENTWOOD | 7140 | — | Yes |
| 631-458 | SAG HARBOR | 4006 | — | Yes |
| 631-459 | BRENTWOOD | 6959 | 2012-01-27 | Yes |
| 631-460 | KINGS PARK | 7133 | — | Yes |
| 631-461 | RIVERHEAD | 6959 | 2011-09-13 | Yes |
| 631-462 | W COMMACK | 9104 | — | — |
| 631-463 | CENTRAISLP | 6622 | — | Yes |
| 631-464 | AMITYVILLE | 997E | 2011-06-09 | Yes |
| 631-465 | FARMINGDL | 7126 | — | Yes |
| 631-466 | RIVERHEAD | 4006 | — | Yes |
| 631-467 | RONKONKOMA | 9104 | — | — |
| 631-468 | RONKONKOMA | 9104 | — | Yes |
| 631-469 | BRENTWOOD | 7126 | 2018-04-24 | Yes |
| 631-470 | HUNTINGTON | 7126 | — | Yes |
| 631-471 | RONKONKOMA | 9104 | — | — |
| 631-472 | BAYPORT | 9104 | — | — |
| 631-473 | PTJEFFERSN | 9104 | — | — |
| 631-474 | PTJEFFERSN | 9104 | — | — |
| 631-475 | PATCHOGUE | 9104 | — | — |
| 631-476 | PTJEFFERSN | 9104 | — | — |
| 631-477 | GREENPORT | 9104 | — | Yes |
| 631-478 | BRENTWOOD | 7133 | — | Yes |
| 631-479 | HUNTINGTON | 4006 | — | Yes |
| 631-480 | AMITYVILLE | 473G | 2012-03-09 | Yes |
| 631-481 | ISLIP | 7133 | — | Yes |
| 631-482 | BABYLON | 612K | 2007-03-29 | Yes |
| 631-483 | MONTAUK PT | 473G | 2012-02-03 | Yes |
| 631-484 | BRENTWOOD | 5562 | 2001-12-31 | Yes |
| 631-485 | MIDLAND | 4006 | — | Yes |
| 631-486 | W COMMACK | 7126 | — | Yes |
| 631-487 | BRENTWOOD | 6959 | 2006-07-18 | Yes |
| 631-488 | SOUTHAMPTN | 612K | 2007-08-21 | Yes |
| 631-489 | W COMMACK | 7133 | — | Yes |
| 631-490 | ATLANTIC | 473G | 2012-03-16 | Yes |
| 631-491 | MIDLAND | 9104 | — | Yes |
| 631-492 | DEER PARK | 9104 | — | Yes |
| 631-493 | W COMMACK | 9104 | — | Yes |
| 631-494 | RIVERHEAD | 6622 | 2009-04-21 | Yes |
| 631-495 | BRENTWOOD | 6959 | — | — |
| 631-496 | SELDEN | 4006 | 2012-02-20 | Yes |
| 631-497 | HUNTINGTON | 384C | 2024-11-11 | Yes |
| 631-498 | COLDSPGHBR | 829J | — | Yes |
| 631-499 | W COMMACK | 9104 | — | — |
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.