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 |
|---|---|---|---|---|---|---|---|
| 2005-05-13 | 661-350-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2005-05-13 | 661-600-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2005-05-03 | 661-537-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLDL PLDL | CA |
| 2005-05-03 | 661-537-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLDL PLDL | CA |
| 2005-05-03 | 661-575-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLDL PLDL | CA |
| 2005-05-03 | 661-817-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2005-04-22 | 661-817-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-21 | 661-487-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| 2005-04-15 | 661-340-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | BKFD MAIN | CA |
| 2005-04-12 | 661-932-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2005-04-08 | 661-742-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD MAIN | CA |
| 2005-04-07 | 661-350-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PLDL PLDL | CA |
| 2005-04-05 | 661-817-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2005-03-31 | 661-370-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | DELANO | CA |
| 2005-03-31 | 661-438-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | WASCO | CA |
| 2005-03-31 | 661-606-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | ARVIN | CA |
| 2005-03-31 | 661-630-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SHAFTER | CA |
| 2005-03-31 | 661-745-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TAFT | CA |
| 2005-03-31 | 661-750-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TEHACHAPI | CA |
| 2005-03-31 | 661-927-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | MCFARLAND | CA |
| 2005-03-30 | 661-347-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNCA SGCC | CA |
| 2005-03-30 | 661-347-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNCA SGCC | CA |
| 2005-03-22 | 661-210-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA NHCS | CA |
| 2005-03-22 | 661-600-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2005-03-22 | 661-874-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | LANCASTER | CA |
| 2005-03-11 | 661-237-6XXX | 6000–6999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SHAFTER | CA |
| 2005-03-11 | 661-247-6XXX | 6000–6999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | ARVIN | CA |
| 2005-03-11 | 661-808-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BKFD MAIN | CA |
| 2005-03-11 | 661-808-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BKFD MAIN | CA |
| 2005-03-11 | 661-808-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BKFD MAIN | CA |
| 2005-03-10 | 661-213-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BKFD NORTH | CA |
| 2005-03-10 | 661-219-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNCA NHCS | CA |
| 2005-03-10 | 661-310-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNCA NHCS | CA |
| 2005-03-10 | 661-310-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNCA NHCS | CA |
| 2005-03-10 | 661-466-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LANCASTER | CA |
| 2005-03-10 | 661-466-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LANCASTER | CA |
| 2005-03-10 | 661-735-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD SOUTH | CA |
| 2005-03-09 | 661-265-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLDL PLDL | CA |
| 2005-03-06 | 661-229-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DELANO | CA |
| 2005-02-25 | 661-466-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | LANCASTER | CA |
| 2005-02-25 | 661-817-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2005-02-24 | 661-350-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| 2005-02-24 | 661-350-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| 2005-02-24 | 661-350-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | 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.