NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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
BANDWIDTH.COM CLEC, LLC - CA 1
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2015-11-24 510-945-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2015-11-24 510-946-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2015-11-24 510-963-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2015-11-24 510-963-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2015-11-13 510-737-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2015-11-13 510-737-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2015-11-13 510-963-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2015-11-13 510-963-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2015-11-12 510-756-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2015-11-10 510-203-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2015-10-30 510-660-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2015-10-30 510-660-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2015-10-30 510-660-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2015-10-28 510-946-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2015-10-21 510-203-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2015-10-21 510-203-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2015-10-21 510-674-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HAYWARD CA
2015-10-19 510-203-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2015-10-15 510-631-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2015-10-05 510-631-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD BKLY CA
2015-10-05 510-631-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD BKLY CA
2015-10-05 510-631-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD BKLY CA
2015-09-30 510-203-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2015-09-30 510-203-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2015-09-30 510-203-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2015-09-29 510-679-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD BKLY CA
2015-09-28 510-422-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2015-09-22 510-203-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2015-09-22 510-203-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2015-09-22 510-241-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2015-09-22 510-696-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2015-09-10 510-756-7XXX 7000–7999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2015-09-10 510-756-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2015-09-10 510-756-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2015-09-09 510-946-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2015-09-08 510-660-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2015-09-04 510-820-0XXX 0000–0999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2015-09-04 510-820-1XXX 1000–1999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2015-09-04 510-937-1XXX 1000–1999Assigned IP HORIZON LLC 515J CROCKETT CA
2015-09-01 510-946-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2015-09-01 510-946-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2015-09-01 510-946-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2015-08-25 510-361-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2015-08-25 510-361-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2015-08-25 510-634-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2015-08-25 510-766-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2015-08-25 510-766-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2015-08-24 510-946-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2015-08-14 510-946-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2015-08-11 510-660-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND 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.