All assignees
799 prefixes in 631 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 631-300 | BRENTWOOD | 9104 | — | Yes |
| 631-301 | FARMINGDL | 073H | 2016-12-05 | Yes |
| 631-302 | E FIRE IS | 384C | — | Yes |
| 631-303 | AMITYVILLE | 5562 | 2017-09-01 | Yes |
| 631-304 | BRENTWOOD | 6959 | 2015-10-13 | Yes |
| 631-305 | BRENTWOOD | 4036 | 2016-02-01 | Yes |
| 631-306 | DEER PARK | 4006 | — | Yes |
| 631-307 | PATCHOGUE | 4036 | — | Yes |
| 631-308 | BRENTWOOD | 6622 | 2020-01-08 | Yes |
| 631-309 | AMITYVILLE | 7126 | 2018-04-13 | Yes |
| 631-310 | PATCHOGUE | 4036 | 2017-01-24 | Yes |
| 631-311 | XXXXXXXXXX | MULT | — | — |
| 631-312 | PATCHOGUE | 7140 | — | Yes |
| 631-313 | ISLIP | 7126 | 2018-06-14 | Yes |
| 631-314 | BABYLON | 073H | — | Yes |
| 631-315 | MATTITUCK | 612K | 2006-12-16 | Yes |
| 631-316 | BRENTWOOD | 6959 | 2007-02-21 | Yes |
| 631-317 | PATCHOGUE | 4036 | 2009-12-04 | Yes |
| 631-318 | AMAGANSETT | 7133 | 2010-01-27 | Yes |
| 631-319 | SAYVILLE | 9104 | 2006-02-03 | Yes |
| 631-320 | SELDEN | 612K | 2006-08-21 | Yes |
| 631-321 | BABYLON | 9104 | — | — |
| 631-322 | BRENTWOOD | 6630 | — | — |
| 631-323 | ORIENT | 9104 | — | Yes |
| 631-324 | E HAMPTON | 9104 | — | — |
| 631-325 | EASTPORT | 9104 | — | Yes |
| 631-326 | COMMACK | 7133 | — | Yes |
| 631-327 | HUNTINGTON | 4036 | 2002-08-27 | Yes |
| 631-328 | BAY SHORE | 829J | — | Yes |
| 631-329 | E HAMPTON | 9104 | — | — |
| 631-330 | FARMINGDL | 7126 | 2011-09-30 | Yes |
| 631-331 | PTJEFFERSN | 9104 | — | — |
| 631-332 | BRENTWOOD | 4036 | 2002-02-15 | Yes |
| 631-333 | GREENPORT | 829J | 2009-05-05 | Yes |
| 631-334 | CENTRAISLP | 6622 | — | Yes |
| 631-335 | BRENTWOOD | 6959 | 2003-07-10 | Yes |
| 631-336 | BRENTWOOD | 5562 | 2010-06-01 | Yes |
| 631-337 | SAYVILLE | 4006 | — | Yes |
| 631-338 | BRENTWOOD | 6959 | 2004-02-18 | Yes |
| 631-339 | BRENTWOOD | 997E | 2010-02-12 | Yes |
| 631-340 | BABYLON | 6630 | — | — |
| 631-341 | YAPHANK | 9104 | — | Yes |
| 631-342 | CENTRAISLP | 9104 | — | Yes |
| 631-343 | COMMACK | 612K | 2003-09-10 | Yes |
| 631-344 | YAPHANK | 9104 | — | — |
| 631-345 | YAPHANK | 9104 | — | Yes |
| 631-346 | SELDEN | 997E | 2010-08-19 | Yes |
| 631-347 | BRENTWOOD | 4036 | 2023-12-15 | Yes |
| 631-348 | CENTRAISLP | 9104 | — | — |
| 631-349 | ORIENT | 384C | 2022-01-27 | Yes |
| 631-350 | HUNTINGTON | 7133 | — | Yes |
| 631-351 | HUNTINGTON | 9104 | — | — |
| 631-352 | SMITHTOWN | 6622 | 2010-08-20 | Yes |
| 631-353 | SOUTHAMPTN | 997E | 2010-08-26 | Yes |
| 631-354 | MATTITUCK | 4006 | — | Yes |
| 631-355 | BRENTWOOD | 6622 | 2003-08-21 | Yes |
| 631-356 | BRENTWOOD | 6622 | 2003-08-21 | Yes |
| 631-357 | BRENTWOOD | 9104 | — | Yes |
| 631-358 | BABYLON | 6959 | 2010-09-10 | Yes |
| 631-359 | WADING RIV | 155E | 2012-09-06 | Yes |
| 631-360 | SMITHTOWN | 9104 | — | — |
| 631-361 | SMITHTOWN | 9104 | — | Yes |
| 631-362 | — | — | ||
| 631-363 | BAYPORT | 9104 | — | Yes |
| 631-364 | STONYBROOK | 829J | 2010-11-08 | Yes |
| 631-365 | BRENTWOOD | 5562 | 2003-09-10 | Yes |
| 631-366 | SMITHTOWN | 9104 | — | Yes |
| 631-367 | COLDSPGHBR | 9104 | — | — |
| 631-368 | W COMMACK | 9104 | — | — |
| 631-369 | RIVERHEAD | 9104 | — | — |
| 631-370 | FARMINGDL | 7140 | — | Yes |
| 631-371 | STONYBROOK | 5562 | 2002-06-17 | Yes |
| 631-372 | BRENTWOOD | 6959 | 2014-12-18 | Yes |
| 631-373 | BRENTWOOD | 6630 | — | — |
| 631-374 | BRENTWOOD | 4036 | 2001-11-14 | — |
| 631-375 | RIVERHEAD | 4036 | 2001-11-14 | — |
| 631-376 | BABYLON | 9104 | — | Yes |
| 631-377 | SOUTHAMPTN | 4036 | 2006-11-21 | Yes |
| 631-378 | SHOREHAM | 4006 | — | Yes |
| 631-379 | BRENTWOOD | 6959 | 2002-01-09 | — |
| 631-380 | STONYBROOK | 7140 | — | Yes |
| 631-381 | RIVERHEAD | 5562 | 2016-06-07 | Yes |
| 631-382 | SMITHTOWN | 9104 | — | Yes |
| 631-383 | BAY SHORE | 5562 | 2002-06-17 | Yes |
| 631-384 | SELDEN | 5562 | 2002-05-14 | Yes |
| 631-385 | HUNTINGTON | 9104 | — | — |
| 631-386 | FARMINGDL | 829J | — | Yes |
| 631-387 | COMMACK | 7140 | — | Yes |
| 631-388 | BRENTWOOD | 612K | 2010-10-25 | Yes |
| 631-389 | RONKONKOMA | 829J | — | Yes |
| 631-390 | FARMINGDL | 7126 | — | — |
| 631-391 | FARMINGDL | 9104 | — | Yes |
| 631-392 | DEER PARK | 612K | 2006-02-14 | Yes |
| 631-393 | FARMINGDL | 7126 | — | Yes |
| 631-394 | YAPHANK | 6622 | 2010-10-26 | Yes |
| 631-395 | ATLANTIC | 9104 | — | — |
| 631-396 | FARMINGDL | 7126 | — | Yes |
| 631-397 | AMITYVILLE | 997E | 2010-02-12 | Yes |
| 631-398 | BRENTWOOD | 6622 | — | — |
| 631-399 | ATLANTIC | 9104 | — | 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.