NumberResearchRecent thousands-block assignments
4 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 510
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 |
|---|---|---|---|---|---|---|---|
| 2009-07-01 | 510-227-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OKLD ALMD | CA |
| 2009-06-30 | 510-924-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2009-06-24 | 510-788-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | OKLD MN-PD | CA |
| 2009-06-22 | 510-854-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | ELSBR-PINL | CA |
| 2009-06-02 | 510-221-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | RICHMOND | CA |
| 2009-05-12 | 510-200-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2009-04-29 | 510-564-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | OKLD TRNID | CA |
| 2009-04-28 | 510-788-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | OKLD MN-PD | CA |
| 2009-04-16 | 510-371-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | FRNK MAIN | CA |
| 2009-04-16 | 510-488-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | OKLD FRTVL | CA |
| 2009-04-15 | 510-269-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | OKLD FRTVL | CA |
| 2009-04-15 | 510-344-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | FRNK OLIVR | CA |
| 2009-04-15 | 510-402-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | FRNK MAIN | CA |
| 2009-03-31 | 510-964-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | ELSBR-PINL | CA |
| 2009-03-27 | 510-356-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | OKLD BKLY | CA |
| 2009-03-25 | 510-200-9XXX | 9000–9999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | HAYWARD | CA |
| 2009-03-23 | 510-590-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OKLD MN-PD | CA |
| 2009-03-12 | 510-239-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | OKLD ALMD | CA |
| 2009-03-12 | 510-239-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | OKLD ALMD | CA |
| 2009-03-12 | 510-585-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | FRNK MAIN | CA |
| 2009-03-12 | 510-857-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | FRNK MAIN | CA |
| 2009-03-11 | 510-379-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | OKLD MN-PD | CA |
| 2009-03-11 | 510-379-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | OKLD MN-PD | CA |
| 2009-03-11 | 510-400-9XXX | 9000–9999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FRNK GRNLF | CA |
| 2009-03-11 | 510-401-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | FRNK GRNLF | CA |
| 2009-03-11 | 510-401-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | FRNK GRNLF | CA |
| 2009-02-23 | 510-200-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | HAYWARD | CA |
| 2009-02-23 | 510-200-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | HAYWARD | CA |
| 2009-02-19 | 510-256-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CROCKETT | CA |
| 2009-02-19 | 510-327-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | HRCUL-RODE | CA |
| 2009-02-19 | 510-371-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | FRNK MAIN | CA |
| 2009-02-19 | 510-964-8XXX | 8000–8999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ELSBR-PINL | CA |
| 2009-02-17 | 510-201-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | OKLD MN-PD | CA |
| 2009-02-17 | 510-201-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | OKLD MN-PD | CA |
| 2009-02-17 | 510-443-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | FRNK MAIN | CA |
| 2009-02-17 | 510-443-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | FRNK MAIN | CA |
| 2009-02-17 | 510-443-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | FRNK MAIN | CA |
| 2009-02-17 | 510-443-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | FRNK MAIN | CA |
| 2009-02-17 | 510-443-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | FRNK MAIN | CA |
| 2009-02-17 | 510-443-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | FRNK MAIN | CA |
| 2009-02-17 | 510-443-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | FRNK MAIN | CA |
| 2009-02-17 | 510-443-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | FRNK 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.