NumberResearchRecent thousands-block assignments
11 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 281
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 |
|---|---|---|---|---|---|---|---|
| 2009-10-08 | 281-661-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | HOUSTON | TX |
| 2009-10-01 | 281-978-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TX | 903C | HSTNSUBURB | TX |
| 2009-10-01 | 281-978-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TX | 903C | HSTNSUBURB | TX |
| 2009-10-01 | 281-978-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TX | 903C | HSTNSUBURB | TX |
| 2009-09-25 | 281-936-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TX | 903C | HOUSTON | TX |
| 2009-09-25 | 281-936-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TX | 903C | HOUSTON | TX |
| 2009-09-25 | 281-936-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TX | 903C | HOUSTON | TX |
| 2009-09-18 | 281-809-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2009-09-17 | 281-826-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TOMBALL | TX |
| 2009-09-14 | 281-301-8XXX | 8000–8999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | BAMMEL | TX |
| 2009-09-14 | 281-301-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | BAMMEL | TX |
| 2009-09-09 | 281-896-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | HSTNSUBURB | TX |
| 2009-09-09 | 281-896-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | HSTNSUBURB | TX |
| 2009-09-09 | 281-896-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | HSTNSUBURB | TX |
| 2009-09-09 | 281-896-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | HSTNSUBURB | TX |
| 2009-09-09 | 281-896-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | HSTNSUBURB | TX |
| 2009-09-08 | 281-640-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | SATSUMA | TX |
| 2009-08-31 | 281-655-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | TOMBALL | TX |
| 2009-08-28 | 281-545-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | SMITHERSLK | TX |
| 2009-08-28 | 281-760-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HSTNSUBURB | TX |
| 2009-08-28 | 281-818-4XXX | 4000–4999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HSTNSUBURB | TX |
| 2009-08-28 | 281-818-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HSTNSUBURB | TX |
| 2009-08-10 | 281-858-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | LANGHAMCRK | TX |
| 2009-08-10 | 281-942-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | SEABROOK | TX |
| 2009-08-03 | 281-656-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | LANGHAMCRK | TX |
| 2009-08-03 | 281-661-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2009-07-28 | 281-673-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | BAMMEL | TX |
| 2009-07-28 | 281-766-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | PINEHURST | TX |
| 2009-07-28 | 281-774-8XXX | 8000–8999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | BAMMEL | TX |
| 2009-07-28 | 281-846-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2009-07-28 | 281-846-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2009-07-28 | 281-877-2XXX | 2000–2999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | BAMMEL | TX |
| 2009-07-27 | 281-818-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HSTNSUBURB | TX |
| 2009-07-27 | 281-912-8XXX | 8000–8999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HSTNSUBURB | TX |
| 2009-07-27 | 281-912-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HSTNSUBURB | TX |
| 2009-07-17 | 281-619-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HSTNSUBURB | TX |
| 2009-07-16 | 281-399-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | SPLENDORA | TX |
| 2009-07-16 | 281-747-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | PORTER | TX |
| 2009-07-16 | 281-913-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2009-07-15 | 281-305-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | PINEHURST | TX |
| 2009-06-24 | 281-601-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTER | TX |
| 2009-06-23 | 281-886-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | HSTNSUBURB | TX |
| 2009-06-22 | 281-815-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | LANGHAMCRK | TX |
| 2009-06-22 | 281-846-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| 2009-06-12 | 281-252-1XXX | 1000–1999 | Assigned | WESTEL, INC. - TX | 7399 | PINEHURST | TX |
| 2009-06-12 | 281-304-3XXX | 3000–3999 | Assigned | WESTEL, INC. - TX | 7399 | CYPRESS | TX |
| 2009-06-12 | 281-320-4XXX | 4000–4999 | Assigned | WESTEL, INC. - TX | 7399 | TOMBALL | TX |
| 2009-06-12 | 281-343-4XXX | 4000–4999 | Assigned | WESTEL, INC. - TX | 7399 | SMITHERSLK | TX |
| 2009-06-12 | 281-346-5XXX | 5000–5999 | Assigned | WESTEL, INC. - TX | 7399 | VLY LODGE | TX |
| 2009-06-12 | 281-393-3XXX | 3000–3999 | Assigned | WESTEL, INC. - TX | 7399 | LIVERPOOL | 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.