NumberResearchRecent thousands-block assignments
16 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 661
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-04-16 | 661-527-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BKFD SOUTH | CA |
| 2015-04-14 | 661-493-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-14 | 661-493-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-14 | 661-520-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2015-04-13 | 661-490-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-04-13 | 661-779-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-04-13 | 661-779-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-04-13 | 661-779-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-04-13 | 661-779-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-04-13 | 661-779-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-04-13 | 661-779-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-04-10 | 661-534-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2015-04-10 | 661-534-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2015-04-10 | 661-534-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2015-04-10 | 661-534-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2015-04-10 | 661-534-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2015-04-10 | 661-556-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BKFD SOUTH | CA |
| 2015-04-10 | 661-556-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BKFD SOUTH | CA |
| 2015-03-18 | 661-234-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2015-03-18 | 661-234-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2015-03-18 | 661-234-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2015-03-13 | 661-383-9XXX | 9000–9999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA NHCS | CA |
| 2015-03-13 | 661-630-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SHAFTER | CA |
| 2015-03-10 | 661-534-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | DELANO | CA |
| 2015-03-09 | 661-421-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-09 | 661-421-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-05 | 661-522-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LANCASTER | CA |
| 2015-03-05 | 661-522-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LANCASTER | CA |
| 2015-03-05 | 661-523-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA SGCC | CA |
| 2015-03-05 | 661-667-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MCFARLAND | CA |
| 2015-03-04 | 661-497-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-04 | 661-534-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DELANO | CA |
| 2015-03-04 | 661-546-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-04 | 661-546-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-04 | 661-546-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-04 | 661-546-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
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.