NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

4 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
ONVOY, LLC - CA 3
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2008-06-23 510-964-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 ELSBR-PINL CA
2008-06-06 510-283-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2008-06-04 510-363-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2008-06-04 510-363-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2008-06-04 510-778-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2008-05-27 510-787-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CROCKETT CA
2008-05-23 510-363-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2008-05-23 510-363-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2008-05-23 510-621-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2008-05-21 510-344-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2008-05-21 510-344-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2008-05-21 510-356-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2008-05-14 510-363-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2008-05-14 510-363-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2008-05-09 510-213-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD FRTVL CA
2008-05-06 510-250-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2008-05-06 510-250-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2008-05-02 510-314-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2008-05-02 510-356-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2008-04-28 510-735-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2008-04-28 510-768-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2008-04-28 510-863-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2008-04-24 510-356-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2008-04-07 510-227-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2008-04-03 510-446-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD MN-PD CA
2008-04-02 510-356-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2008-04-02 510-356-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2008-04-01 510-621-4XXX 4000–4999Assigned METROPCS, INC. 5562 RICHMOND CA
2008-03-18 510-778-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2008-03-18 510-778-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2008-03-13 510-434-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2008-02-22 510-214-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2008-02-15 510-662-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELSBR-PINL CA
2008-02-01 510-240-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2008-01-31 510-253-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2008-01-30 510-854-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 ELSBR-PINL CA
2008-01-29 510-692-5XXX 5000–5999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-01-29 510-692-6XXX 6000–6999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-01-29 510-692-7XXX 7000–7999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-01-29 510-692-8XXX 8000–8999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-01-28 510-230-1XXX 1000–1999Assigned METROPCS, INC. 5562 RICHMOND CA
2008-01-22 510-230-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2008-01-18 510-230-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2008-01-18 510-493-5XXX 5000–5999Assigned METROPCS, INC. 5562 FRNK MAIN CA
2008-01-17 510-827-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2008-01-17 510-896-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2008-01-16 510-394-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2008-01-15 510-363-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2008-01-15 510-363-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2008-01-15 510-363-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD 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.