NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 346
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-08-13 | 346-829-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SUGAR LAND | TX |
| 2016-08-30 | 346-215-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALVIN | TX |
| 2016-08-30 | 346-236-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TOMBALL | TX |
| 2016-07-15 | 346-410-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2016-05-25 | 346-410-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2016-05-23 | 346-954-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DEER PARK | TX |
| 2016-05-19 | 346-352-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-10-13 | 346-308-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-08-19 | 346-224-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SPRING | TX |
| 2015-08-19 | 346-808-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TOMBALL | TX |
| 2015-07-06 | 346-240-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-07-06 | 346-240-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-07-06 | 346-240-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-06-29 | 346-312-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2015-06-29 | 346-312-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2015-06-22 | 346-248-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PINEHURST | TX |
| 2015-05-18 | 346-701-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-05-18 | 346-701-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-05-05 | 346-978-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LANGHAMCRK | TX |
| 2015-04-30 | 346-206-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SATSUMA | TX |
| 2015-04-02 | 346-219-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2015-04-02 | 346-219-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2015-03-13 | 346-218-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CYPRESS | TX |
| 2015-03-12 | 346-980-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-03-12 | 346-980-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-03-12 | 346-980-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2015-01-08 | 346-207-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2015-01-08 | 346-207-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2014-10-30 | 346-888-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2014-08-08 | 346-444-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2014-08-08 | 346-444-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2014-08-01 | 346-888-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.