SOUTHWESTERN BELL
16 prefixes in 346 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 346-207 | HSTNSUBURB | 9533 | 2014-12-16 | Yes |
| 346-246 | TOMBALL | 9533 | 2017-03-27 | Yes |
| 346-265 | HOUSTON | 9533 | 2017-07-18 | Yes |
| 346-286 | HOUSTON | 9533 | 2017-04-11 | Yes |
| 346-305 | SPRING | 9533 | 2015-05-07 | Yes |
| 346-720 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-721 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-722 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-723 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-725 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-726 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-727 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-728 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-729 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-834 | HOUSTON | 9533 | 2014-02-27 | Yes |
| 346-971 | HOUSTON | 9533 | 2015-09-14 | 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.