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
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-03-04 | 661-546-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-03-03 | 661-220-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-03-03 | 661-220-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-03-03 | 661-220-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-03-03 | 661-220-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-03-03 | 661-485-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | PLDL PLDL | CA |
| 2015-02-26 | 661-232-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MOJAVE | CA |
| 2015-02-26 | 661-279-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ROSAMOND | CA |
| 2015-02-26 | 661-289-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LEBEC | CA |
| 2015-02-26 | 661-300-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TEHACHAPI | CA |
| 2015-02-26 | 661-443-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WALKERBSIN | CA |
| 2015-02-26 | 661-457-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LOST HILLS | CA |
| 2015-02-26 | 661-459-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SHAFTER | CA |
| 2015-02-26 | 661-469-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BUTTONWLLW | CA |
| 2015-02-26 | 661-491-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BKFD SOUTH | CA |
| 2015-02-26 | 661-525-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BKFD NORTH | CA |
| 2015-02-26 | 661-548-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CLFRNHTSPG | CA |
| 2015-02-26 | 661-552-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | EARLIMART | CA |
| 2015-02-26 | 661-745-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TAFT | CA |
| 2015-02-26 | 661-761-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MCKITTRICK | CA |
| 2015-02-26 | 661-766-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CUYAMA | CA |
| 2015-02-26 | 661-772-0XXX | 0000–0999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WASCO | CA |
| 2015-02-26 | 661-779-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ARVIN | CA |
| 2015-02-26 | 661-927-9XXX | 9000–9999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MCFARLAND | CA |
| 2015-02-25 | 661-491-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD SOUTH | CA |
| 2015-02-25 | 661-495-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2015-02-25 | 661-495-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2015-02-25 | 661-495-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2015-02-25 | 661-577-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | TAFT | CA |
| 2015-02-25 | 661-577-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | TAFT | CA |
| 2015-02-24 | 661-825-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | TEHACHAPI | CA |
| 2015-02-24 | 661-825-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | TEHACHAPI | CA |
| 2015-02-17 | 661-383-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | SNCA NHCS | CA |
| 2015-02-17 | 661-383-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | SNCA NHCS | CA |
| 2015-02-16 | 661-546-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BKFD MAIN | CA |
| 2015-02-10 | 661-372-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | DELANO | CA |
| 2015-02-09 | 661-522-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LANCASTER | CA |
| 2015-02-04 | 661-436-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | ARVIN | CA |
| 2015-02-04 | 661-494-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LANCASTER | CA |
| 2015-02-04 | 661-494-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LANCASTER | CA |
| 2015-02-04 | 661-494-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LANCASTER | CA |
| 2015-02-03 | 661-384-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-384-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-384-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-497-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-497-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-497-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-497-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-497-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-02-03 | 661-497-6XXX | 6000–6999 | 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.