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31 prefixes in 346 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 346-219 | HSTNSUBURB | 318J | 2015-01-28 | Yes |
| 346-223 | HOUSTON | 318J | 2016-02-04 | Yes |
| 346-224 | SPRING | 318J | 2015-06-22 | Yes |
| 346-226 | HOUSTON | 318J | 2016-02-04 | Yes |
| 346-227 | HOUSTON | 318J | 2016-02-04 | Yes |
| 346-240 | HOUSTON | 318J | 2015-06-22 | Yes |
| 346-270 | BAMMEL | 318J | 2015-08-18 | Yes |
| 346-304 | STAFFORD | 318J | 2015-07-28 | Yes |
| 346-309 | SUGAR LAND | 318J | 2015-09-28 | Yes |
| 346-319 | HOUSTON | 318J | 2015-12-17 | Yes |
| 346-331 | SPRING | 318J | 2015-07-17 | Yes |
| 346-335 | HOUSTON | 318J | 2018-04-17 | Yes |
| 346-341 | STAFFORD | 318J | 2018-05-29 | Yes |
| 346-342 | HSTNSUBURB | 318J | 2018-05-29 | Yes |
| 346-385 | FRIENDSWD | 318J | 2019-03-27 | Yes |
| 346-389 | BEACH CITY | 318J | 2019-07-26 | Yes |
| 346-409 | HSTNSUBURB | 318J | 2019-12-24 | Yes |
| 346-423 | PORTER | 318J | 2020-02-26 | Yes |
| 346-439 | HSTNSUBURB | 318J | 2020-10-05 | Yes |
| 346-440 | HSTNSUBURB | 318J | 2020-10-05 | Yes |
| 346-441 | HOUSTON | 318J | 2020-10-05 | Yes |
| 346-442 | SPRING | 318J | 2020-10-07 | Yes |
| 346-443 | SPRING | 318J | 2020-10-07 | Yes |
| 346-571 | HOUSTON | 318J | 2015-09-15 | Yes |
| 346-590 | WESTFIELD | 318J | 2022-09-20 | Yes |
| 346-591 | PORTER HTS | 318J | 2022-09-21 | Yes |
| 346-594 | BARKER | 318J | 2022-10-03 | Yes |
| 346-618 | HOUSTON | 318J | 2023-02-23 | Yes |
| 346-635 | HSTNSUBURB | 318J | 2023-03-10 | Yes |
| 346-650 | VLY LODGE | 318J | 2023-04-28 | Yes |
| 346-703 | PINEHURST | 318J | 2015-03-04 | 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.