NumberResearchRecent thousands-block assignments
36 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, last 30 days — NPA 346
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-08-08 | 346-444-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | HOUSTON | 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 |
| 2014-08-08 | 346-444-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | HOUSTON | TX |
| 2014-08-08 | 346-444-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | HOUSTON | TX |
| 2014-08-08 | 346-444-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | HOUSTON | TX |
| 2014-08-01 | 346-888-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2014-07-23 | 346-222-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | LA PORTE | TX |
| 2014-07-10 | 346-247-0XXX | 0000–0999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-247-1XXX | 1000–1999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-247-4XXX | 4000–4999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-247-5XXX | 5000–5999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-247-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-247-8XXX | 8000–8999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-247-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-0XXX | 0000–0999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-1XXX | 1000–1999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-2XXX | 2000–2999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-3XXX | 3000–3999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-4XXX | 4000–4999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-5XXX | 5000–5999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-7XXX | 7000–7999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-07-10 | 346-932-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HOUSTON | TX |
| 2014-06-13 | 346-247-2XXX | 2000–2999 | Assigned | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7074 | HOUSTON | TX |
| 2014-06-13 | 346-247-3XXX | 3000–3999 | Assigned | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7074 | HOUSTON | TX |
| 2014-05-08 | 346-932-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TX | 903C | HOUSTON | TX |
| 2014-02-27 | 346-720-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | 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.