All assignees
800 prefixes in 281 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 281-500 | LANGHAMCRK | 6114 | — | Yes |
| 281-501 | HOUSTON | 318J | 2006-11-21 | Yes |
| 281-502 | HIGHLANDS | 7239 | — | Yes |
| 281-503 | PORTER HTS | 7670 | — | Yes |
| 281-504 | HSTNSUBURB | 7239 | — | Yes |
| 281-505 | KATY | 7239 | 2019-02-08 | Yes |
| 281-506 | HSTNSUBURB | 7138 | — | Yes |
| 281-507 | HOUSTON | 6506 | — | — |
| 281-508 | DICKINSON | 6534 | 2006-05-15 | Yes |
| 281-509 | HSTNSUBURB | 9533 | — | Yes |
| 281-510 | HOUSTON | 6630 | — | — |
| 281-511 | XXXXXXXXXX | MULT | — | — |
| 281-512 | HSTNSUBURB | 5562 | 2012-10-02 | Yes |
| 281-513 | HOUSTON | 6534 | — | — |
| 281-514 | BAMMEL | 9533 | — | — |
| 281-515 | BAYTOWN | 6534 | 2006-05-15 | Yes |
| 281-516 | TOMBALL | 9533 | — | Yes |
| 281-517 | SATSUMA | 9533 | — | — |
| 281-518 | BAMMEL | 9533 | — | — |
| 281-519 | MANVEL | 6114 | — | Yes |
| 281-520 | HOUSTON | 6506 | 2006-03-27 | Yes |
| 281-521 | KEMAH | 4344 | — | — |
| 281-522 | KEMAH | 4344 | — | Yes |
| 281-523 | KEMAH | 4344 | — | — |
| 281-524 | KEMAH | 4344 | — | Yes |
| 281-525 | LEAGUECITY | 4344 | — | Yes |
| 281-526 | LEAGUECITY | 4344 | — | — |
| 281-527 | HOUSTON | 6630 | — | — |
| 281-528 | SPRING | 9533 | — | Yes |
| 281-529 | HSTNSUBURB | 9533 | — | Yes |
| 281-530 | HSTNSUBURB | 9533 | — | — |
| 281-531 | HSTNSUBURB | 9533 | — | — |
| 281-532 | KEMAH | 4344 | — | Yes |
| 281-533 | VLY LODGE | 9533 | — | Yes |
| 281-534 | DICKINSON | 4344 | — | — |
| 281-535 | KEMAH | 4344 | — | Yes |
| 281-536 | HOUSTON | 6534 | — | — |
| 281-537 | BAMMEL | 9533 | — | — |
| 281-538 | KEMAH | 4344 | — | — |
| 281-539 | BAMMEL | 9533 | — | — |
| 281-540 | HUMBLE | 2114 | — | — |
| 281-541 | SPRING | 6701 | — | Yes |
| 281-542 | DEER PARK | 9533 | — | Yes |
| 281-543 | HOUSTON | 6506 | — | — |
| 281-544 | HSTNSUBURB | 9533 | — | Yes |
| 281-545 | SMITHERSLK | 9533 | — | Yes |
| 281-546 | HOUSTON | 6534 | — | — |
| 281-547 | TOMBALL | 6114 | — | Yes |
| 281-548 | HUMBLE | 2114 | — | — |
| 281-549 | KEMAH | 7138 | — | Yes |
| 281-550 | LANGHAMCRK | 9533 | — | — |
| 281-551 | BAMMEL | 6630 | — | — |
| 281-552 | HSTNSUBURB | 9533 | — | Yes |
| 281-553 | WESTFIELD | 7239 | — | — |
| 281-554 | LEAGUECITY | 4344 | — | — |
| 281-555 | DIR ASST | MULT | — | — |
| 281-556 | HSTNSUBURB | 9533 | — | Yes |
| 281-557 | LEAGUECITY | 4344 | — | Yes |
| 281-558 | HSTNSUBURB | 9533 | — | — |
| 281-559 | KEMAH | 4344 | — | Yes |
| 281-560 | HSTNSUBURB | 9533 | — | Yes |
| 281-561 | HSTNSUBURB | 9533 | — | — |
| 281-562 | BAMMEL | 7138 | 2019-01-10 | Yes |
| 281-563 | SUGAR LAND | 2147 | — | — |
| 281-564 | HSTNSUBURB | 9533 | — | — |
| 281-565 | SUGAR LAND | 2147 | — | — |
| 281-566 | SUGAR LAND | 2147 | — | — |
| 281-567 | HOUSTON | 9748 | — | — |
| 281-568 | HSTNSUBURB | 9533 | — | — |
| 281-569 | BAMMEL | 7074 | — | Yes |
| 281-570 | HUMBLE | 7074 | — | Yes |
| 281-571 | SATSUMA | 7138 | — | Yes |
| 281-572 | PORTER HTS | 2114 | — | Yes |
| 281-573 | BEACH CITY | 4344 | — | Yes |
| 281-574 | KATY | 2109 | — | Yes |
| 281-575 | HSTNSUBURB | 9533 | — | — |
| 281-576 | MONTBLVIEU | 4344 | — | Yes |
| 281-577 | PORTER | 2114 | — | Yes |
| 281-578 | BARKER | 9533 | — | — |
| 281-579 | BARKER | 9533 | — | — |
| 281-580 | BAMMEL | 9533 | — | — |
| 281-581 | LIVERPOOL | 9533 | — | Yes |
| 281-582 | HSTNSUBURB | 7074 | — | — |
| 281-583 | BAMMEL | 9533 | — | — |
| 281-584 | HSTNSUBURB | 9533 | — | Yes |
| 281-585 | ALVIN | 9533 | — | — |
| 281-586 | BAMMEL | 9533 | — | — |
| 281-587 | BAMMEL | 9533 | — | — |
| 281-588 | HSTNSUBURB | 9533 | — | Yes |
| 281-589 | HSTNSUBURB | 9533 | — | — |
| 281-590 | HSTNSUBURB | 9533 | — | — |
| 281-591 | HSTNSUBURB | 9533 | — | Yes |
| 281-592 | CLEVELAND | 9533 | — | — |
| 281-593 | CLEVELAND | 9533 | — | Yes |
| 281-594 | HSTNSUBURB | 9533 | — | Yes |
| 281-595 | ROSHARON | 4344 | — | Yes |
| 281-596 | HSTNSUBURB | 9533 | — | — |
| 281-597 | HSTNSUBURB | 9533 | — | — |
| 281-598 | HSTNSUBURB | 903C | — | — |
| 281-599 | BARKER | 9533 | — | — |
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.