All assignees
799 prefixes in 631 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 631-800 | SOUTHAMPTN | 384C | — | Yes |
| 631-801 | EASTPORT | 7126 | — | Yes |
| 631-802 | PTJEFFERSN | 829J | — | Yes |
| 631-803 | BELLPORT | 7126 | — | Yes |
| 631-804 | BRENTWOOD | 6959 | 2001-05-04 | — |
| 631-805 | AMITYVILLE | 6622 | 2001-05-16 | — |
| 631-806 | BRENTWOOD | 6959 | 2001-10-05 | — |
| 631-807 | BRENTWOOD | 6959 | 2002-04-18 | — |
| 631-808 | SAG HARBOR | 508J | — | Yes |
| 631-809 | DEER PARK | 5562 | 2018-07-12 | Yes |
| 631-810 | LINDENHST | 384C | 2020-12-16 | Yes |
| 631-811 | XXXXXXXXXX | MULT | — | — |
| 631-812 | HUNTINGTON | 829J | 2001-05-09 | Yes |
| 631-813 | BRENTWOOD | 4006 | 2004-10-15 | Yes |
| 631-814 | BABYLON | 384C | 2022-10-10 | Yes |
| 631-815 | FARMINGDL | 4006 | — | Yes |
| 631-816 | YAPHANK | 6622 | 2002-09-19 | Yes |
| 631-817 | FIREISLAND | 384C | — | Yes |
| 631-818 | BABYLON | 7126 | 2018-10-30 | Yes |
| 631-819 | BAY SHORE | 425J | 2019-09-16 | Yes |
| 631-820 | RONKONKOMA | 7133 | — | Yes |
| 631-821 | SHOREHAM | 9104 | — | — |
| 631-822 | CENTRAISLP | 829J | — | Yes |
| 631-823 | BAYPORT | 7140 | — | Yes |
| 631-824 | HUNTINGTON | 829J | — | Yes |
| 631-825 | MONTAUK PT | 997E | 2014-08-01 | Yes |
| 631-826 | NASSAUZN09 | 9104 | — | Yes |
| 631-827 | HUNTINGTON | 4036 | 2002-05-16 | — |
| 631-828 | PTJEFFERSN | 7126 | — | Yes |
| 631-829 | AMITYVILLE | 6622 | 2015-09-08 | Yes |
| 631-830 | RIVERHEAD | 4006 | — | Yes |
| 631-831 | BRENTWOOD | 5562 | — | Yes |
| 631-832 | BAYPORT | 7133 | — | Yes |
| 631-833 | RIVERHEAD | 6622 | 2002-09-06 | Yes |
| 631-834 | BRENTWOOD | 6959 | — | — |
| 631-835 | BRENTWOOD | 4036 | 2001-06-04 | — |
| 631-836 | BRENTWOOD | 6622 | 2001-06-14 | — |
| 631-837 | NORTHPORT | 7133 | — | Yes |
| 631-838 | BRENTWOOD | 4036 | — | — |
| 631-839 | BRENTWOOD | 6622 | 2001-01-16 | — |
| 631-840 | ISLIP | 4006 | — | Yes |
| 631-841 | AMITYVILLE | 9104 | — | Yes |
| 631-842 | AMITYVILLE | 9104 | — | — |
| 631-843 | FARMINGDL | 9104 | — | Yes |
| 631-844 | FARMINGDL | 9104 | — | Yes |
| 631-845 | FARMINGDL | 9104 | — | Yes |
| 631-846 | SELDEN | 7126 | 2001-01-16 | Yes |
| 631-847 | FARMINGDL | 9104 | — | Yes |
| 631-848 | BRENTWOOD | 6959 | 2002-06-24 | Yes |
| 631-849 | SHOREHAM | 7126 | — | Yes |
| 631-850 | W COMMACK | 7133 | — | Yes |
| 631-851 | CENTRAISLP | 9104 | — | — |
| 631-852 | RIVERHEAD | 9104 | — | — |
| 631-853 | CENTRAISLP | 9104 | — | Yes |
| 631-854 | BRENTWOOD | 9104 | — | — |
| 631-855 | DEER PARK | 5562 | — | Yes |
| 631-856 | HAMPTNBAYS | 612K | — | Yes |
| 631-857 | COLDSPGHBR | 7133 | — | Yes |
| 631-858 | W COMMACK | 9104 | — | Yes |
| 631-859 | ISLIP | 9104 | — | Yes |
| 631-860 | DEER PARK | 7229 | — | Yes |
| 631-861 | FARMINGDL | 7133 | — | Yes |
| 631-862 | ST JAMES | 9104 | — | Yes |
| 631-863 | SMITHTOWN | 9104 | — | Yes |
| 631-864 | COMMACK | 9104 | — | — |
| 631-865 | DEER PARK | 4006 | — | Yes |
| 631-866 | BELLPORT | 7140 | — | Yes |
| 631-867 | LINDENHST | 4006 | — | Yes |
| 631-868 | BAYPORT | 7126 | — | Yes |
| 631-869 | BELLPORT | 7133 | — | Yes |
| 631-870 | CENTRAISLP | 829J | — | Yes |
| 631-871 | RIVERHEAD | 4036 | 2002-03-15 | — |
| 631-872 | BRENTWOOD | 5562 | 2001-06-27 | Yes |
| 631-873 | BRENTWOOD | 6959 | 2004-10-14 | Yes |
| 631-874 | CTRMORICHS | 9104 | — | — |
| 631-875 | RIVERHEAD | 4036 | 2001-07-18 | — |
| 631-876 | SOUTHOLD | 4006 | 2004-08-17 | Yes |
| 631-877 | BRENTWOOD | 6622 | 2001-08-02 | — |
| 631-878 | CTRMORICHS | 9104 | — | — |
| 631-879 | PATCHOGUE | 7133 | — | Yes |
| 631-880 | SELDEN | 4036 | 2004-11-08 | Yes |
| 631-881 | CENTRAISLP | 7421 | — | Yes |
| 631-882 | CENTRAISLP | 6622 | 2001-05-16 | — |
| 631-883 | BAYPORT | 7133 | — | Yes |
| 631-884 | LINDENHST | 9104 | — | Yes |
| 631-885 | BRENTWOOD | 6622 | 2004-10-27 | Yes |
| 631-886 | WADING RIV | 7126 | — | Yes |
| 631-887 | HAMPTNBAYS | 829J | 2001-10-10 | Yes |
| 631-888 | LINDENHST | 9104 | — | Yes |
| 631-889 | DEER PARK | 6622 | 2002-04-15 | Yes |
| 631-890 | PATCHOGUE | 9104 | — | — |
| 631-891 | PATCHOGUE | 829J | 2004-05-24 | Yes |
| 631-892 | BAY SHORE | 7133 | — | Yes |
| 631-893 | BABYLON | 9104 | — | Yes |
| 631-894 | BAY SHORE | 7140 | — | Yes |
| 631-895 | QUOGUE | 384C | — | Yes |
| 631-896 | NORTHPORT | 5562 | 2002-06-17 | Yes |
| 631-897 | HUNTINGTON | 4036 | 2001-10-03 | — |
| 631-898 | WESTHAMPTN | 9104 | — | Yes |
| 631-899 | SAG HARBOR | 4006 | — | 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.