NumberResearchRecent thousands-block assignments
18 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 |
|---|---|---|---|---|---|---|---|
| 2006-11-10 | 661-720-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DELANO | CA |
| 2006-11-07 | 661-526-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2006-11-07 | 661-902-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | LANCASTER | CA |
| 2006-11-02 | 661-862-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2006-10-24 | 661-526-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL PLDL | CA |
| 2006-10-19 | 661-268-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL AGDL | CA |
| 2006-10-04 | 661-874-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | LANCASTER | CA |
| 2006-10-03 | 661-735-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | BKFD SOUTH | CA |
| 2006-10-03 | 661-735-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | BKFD SOUTH | CA |
| 2006-09-27 | 661-557-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | ARVIN | CA |
| 2006-09-26 | 661-480-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2006-09-26 | 661-480-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2006-09-19 | 661-480-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLDL PLDL | CA |
| 2006-09-17 | 661-309-0XXX | 0000–0999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2006-09-17 | 661-343-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2006-09-14 | 661-316-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BKFD MAIN | CA |
| 2006-09-14 | 661-316-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BKFD MAIN | CA |
| 2006-09-14 | 661-808-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BKFD MAIN | CA |
| 2006-09-13 | 661-972-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TEHACHAPI | CA |
| 2006-09-08 | 661-341-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LANCASTER | CA |
| 2006-09-08 | 661-341-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LANCASTER | CA |
| 2006-08-31 | 661-214-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LOST HILLS | CA |
| 2006-08-31 | 661-214-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | LOST HILLS | CA |
| 2006-08-31 | 661-413-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CUYAMA | CA |
| 2006-08-31 | 661-413-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CUYAMA | CA |
| 2006-08-31 | 661-469-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BUTTONWLLW | CA |
| 2006-08-31 | 661-551-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BERENDMESA | CA |
| 2006-08-31 | 661-551-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BERENDMESA | CA |
| 2006-08-31 | 661-591-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GLENNVILLE | CA |
| 2006-08-31 | 661-591-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | GLENNVILLE | CA |
| 2006-08-31 | 661-689-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CLFRNHTSPG | CA |
| 2006-08-31 | 661-689-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CLFRNHTSPG | CA |
| 2006-08-31 | 661-704-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MCKITTRICK | CA |
| 2006-08-31 | 661-704-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MCKITTRICK | CA |
| 2006-08-31 | 661-745-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TAFT | CA |
| 2006-08-31 | 661-745-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TAFT | CA |
| 2006-08-31 | 661-927-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MCFARLAND | CA |
| 2006-08-31 | 661-927-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MCFARLAND | CA |
| 2006-08-29 | 661-360-8XXX | 8000–8999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA SGCC | CA |
| 2006-08-29 | 661-360-9XXX | 9000–9999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA SGCC | CA |
| 2006-08-29 | 661-476-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA NHCS | CA |
| 2006-08-28 | 661-476-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2006-08-25 | 661-480-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLDL PLDL | CA |
| 2006-08-25 | 661-480-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLDL PLDL | CA |
| 2006-08-25 | 661-794-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2006-08-22 | 661-863-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2006-08-22 | 661-863-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2006-08-18 | 661-370-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DELANO | CA |
| 2006-08-18 | 661-370-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DELANO | CA |
| 2006-08-15 | 661-874-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | LANCASTER | 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.