NumberResearchRecent thousands-block assignments
16 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 |
|---|---|---|---|---|---|---|---|
| 2015-08-25 | 661-576-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| 2015-08-25 | 661-576-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| 2015-08-25 | 661-622-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | PLDL LNVY | CA |
| 2015-08-21 | 661-306-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LAKEHUGHES | CA |
| 2015-08-21 | 661-320-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | LEBEC | CA |
| 2015-08-21 | 661-339-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HI VISTA | CA |
| 2015-08-21 | 661-522-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LANCASTER | CA |
| 2015-08-12 | 661-522-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | LANCASTER | CA |
| 2015-08-12 | 661-576-0XXX | 0000–0999 | Assigned | METROPCS NETWORKS, LLC | 899D | PLDL PLDL | CA |
| 2015-08-12 | 661-759-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | WASCO | CA |
| 2015-08-11 | 661-542-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA SGCC | CA |
| 2015-08-10 | 661-495-4XXX | 4000–4999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA NHCS | CA |
| 2015-08-04 | 661-535-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD NORTH | CA |
| 2015-08-04 | 661-543-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MCFARLAND | CA |
| 2015-08-03 | 661-462-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | BIG BUTTE | CA |
| 2015-08-03 | 661-576-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2015-08-03 | 661-576-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2015-07-31 | 661-564-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | BKFD SOUTH | CA |
| 2015-07-30 | 661-234-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2015-07-29 | 661-542-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA SGCC | CA |
| 2015-07-28 | 661-425-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA NHCS | CA |
| 2015-07-28 | 661-563-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2015-07-21 | 661-234-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | PLDL PLDL | CA |
| 2015-07-21 | 661-234-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | PLDL PLDL | CA |
| 2015-07-21 | 661-234-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | PLDL PLDL | CA |
| 2015-07-21 | 661-234-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | PLDL PLDL | CA |
| 2015-07-21 | 661-522-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LANCASTER | CA |
| 2015-07-16 | 661-535-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD NORTH | CA |
| 2015-07-16 | 661-573-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2015-07-16 | 661-573-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2015-07-13 | 661-384-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2015-07-13 | 661-493-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2015-07-06 | 661-731-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | EARLIMART | CA |
| 2015-07-06 | 661-752-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ROSAMOND | CA |
| 2015-07-01 | 661-754-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MOJAVE | CA |
| 2015-06-30 | 661-220-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-220-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-436-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-557-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-855-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-855-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-855-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-30 | 661-855-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2015-06-23 | 661-383-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNCA NHCS | CA |
| 2015-06-23 | 661-383-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNCA NHCS | CA |
| 2015-06-16 | 661-234-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL PLDL | CA |
| 2015-06-09 | 661-592-3XXX | 3000–3999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2015-06-09 | 661-592-4XXX | 4000–4999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2015-06-09 | 661-592-5XXX | 5000–5999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2015-06-09 | 661-592-6XXX | 6000–6999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.