NumberResearchRecent thousands-block assignments
0 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, all time — NPA 310
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
May 2026
Apr 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-01-25 | 310-733-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CULVERCITY | CA |
| 2005-01-21 | 310-736-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CULVERCITY | CA |
| 2005-01-21 | 310-803-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | TORRANCE | CA |
| 2005-01-21 | 310-986-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LOMITA | CA |
| 2005-01-19 | 310-595-7XXX | 7000–7999 | Assigned | METROPCS NETWORKS, LLC | 899D | BEVERLYHLS | CA |
| 2005-01-19 | 310-654-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | INGLEWOOD | CA |
| 2005-01-18 | 310-622-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | W ANGELES | CA |
| 2005-01-17 | 310-895-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | CULVERCITY | CA |
| 2005-01-14 | 310-469-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | EL SEGUNDO | CA |
| 2005-01-14 | 310-469-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | EL SEGUNDO | CA |
| 2005-01-14 | 310-500-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W ANGELES | CA |
| 2005-01-14 | 310-571-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W ANGELES | CA |
| 2005-01-14 | 310-575-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W ANGELES | CA |
| 2005-01-14 | 310-862-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNMN MRVS | CA |
| 2005-01-14 | 310-984-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SAN PEDRO | CA |
| 2005-01-14 | 310-984-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SAN PEDRO | CA |
| 2005-01-14 | 310-984-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SAN PEDRO | CA |
| 2005-01-13 | 310-263-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HAWTHORNE | CA |
| 2005-01-13 | 310-579-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MALIBU | CA |
| 2005-01-13 | 310-654-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | INGLEWOOD | CA |
| 2005-01-11 | 310-589-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | MALIBU | CA |
| 2005-01-11 | 310-589-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | MALIBU | CA |
| 2005-01-11 | 310-601-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BEVERLYHLS | CA |
| 2005-01-11 | 310-601-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | BEVERLYHLS | CA |
| 2005-01-11 | 310-633-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNMN SNMN | CA |
| 2005-01-11 | 310-633-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNMN SNMN | CA |
| 2005-01-11 | 310-683-4XXX | 4000–4999 | Assigned | TWILIO INTERNATIONAL, INC. | 506J | REDONDO | CA |
| 2005-01-11 | 310-683-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | REDONDO | CA |
| 2005-01-11 | 310-750-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | REDONDO | CA |
| 2005-01-11 | 310-750-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | REDONDO | CA |
| 2005-01-11 | 310-907-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SNMN SNMN | CA |
| 2005-01-11 | 310-907-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SNMN SNMN | CA |
| 2005-01-11 | 310-923-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | W ANGELES | CA |
| 2005-01-11 | 310-923-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | W ANGELES | CA |
| 2005-01-06 | 310-357-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TORRANCE | CA |
| 2005-01-06 | 310-357-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TORRANCE | CA |
| 2005-01-06 | 310-773-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNMN MRVS | CA |
| 2005-01-05 | 310-984-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SAN PEDRO | CA |
| 2005-01-04 | 310-341-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | EL SEGUNDO | CA |
| 2005-01-03 | 310-986-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | LOMITA | CA |
| 2005-01-03 | 310-986-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | LOMITA | CA |
| 2004-12-29 | 310-582-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SNMN SNMN | CA |
| 2004-12-21 | 310-817-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CMTN GRDN | CA |
| 2004-12-21 | 310-878-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CMTN GRDN | CA |
| 2004-12-20 | 310-966-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | W ANGELES | CA |
| 2004-12-17 | 310-878-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CMTN GRDN | CA |
| 2004-12-17 | 310-984-0XXX | 0000–0999 | Assigned | METROPCS NETWORKS, LLC | 899D | SAN PEDRO | CA |
| 2004-12-17 | 310-984-9XXX | 9000–9999 | Assigned | METROPCS NETWORKS, LLC | 899D | SAN PEDRO | CA |
| 2004-12-15 | 310-882-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | W ANGELES | CA |
| 2004-12-14 | 310-228-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BEVERLYHLS | 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.