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
2004-11-16 510-565-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2004-11-05 510-875-5XXX 5000–5999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2004-11-03 510-257-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2004-10-13 510-461-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2004-10-13 510-962-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2004-10-11 510-229-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2004-10-11 510-566-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2004-10-07 510-323-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2004-09-28 510-213-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2004-09-28 510-759-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2004-09-23 510-461-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2004-09-14 510-557-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2004-09-14 510-789-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2004-09-14 510-789-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2004-09-07 510-962-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2004-09-01 510-269-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD FRTVL CA
2004-09-01 510-291-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2004-08-21 510-565-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2004-08-21 510-717-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2004-08-13 510-495-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2004-08-13 510-495-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2004-07-30 510-456-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2004-07-30 510-456-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2004-07-30 510-456-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2004-07-29 510-566-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2004-07-29 510-566-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2004-07-01 510-342-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2004-07-01 510-725-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2004-06-25 510-336-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C OKLD FRTVL CA
2004-06-24 510-344-4XXX 4000–4999Assigned AT&T - LOCAL 7421 FRNK OLIVR CA
2004-06-22 510-402-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2004-06-16 510-962-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2004-06-10 510-759-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2004-06-07 510-300-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2004-06-07 510-875-8XXX 8000–8999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2004-05-27 510-565-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2004-05-19 510-266-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2004-04-29 510-253-3XXX 3000–3999Assigned METROPCS, INC. 5562 RICHMOND CA
2004-04-29 510-258-3XXX 3000–3999Assigned METROPCS, INC. 5562 HAYWARD CA
2004-04-29 510-372-3XXX 3000–3999Assigned METROPCS, INC. 5562 HAYWARD CA
2004-04-29 510-372-4XXX 4000–4999Assigned METROPCS, INC. 5562 HAYWARD CA
2004-04-29 510-372-5XXX 5000–5999Assigned METROPCS, INC. 5562 HAYWARD CA
2004-04-29 510-372-6XXX 6000–6999Assigned METROPCS, INC. 5562 HAYWARD CA
2004-04-29 510-372-7XXX 7000–7999Assigned METROPCS, INC. 5562 HAYWARD CA
2004-04-29 510-478-2XXX 2000–2999Assigned METROPCS, INC. 5562 RICHMOND CA
2004-04-29 510-478-3XXX 3000–3999Assigned METROPCS, INC. 5562 RICHMOND CA
2004-04-29 510-478-4XXX 4000–4999Assigned METROPCS, INC. 5562 RICHMOND CA
2004-04-29 510-478-5XXX 5000–5999Assigned METROPCS, INC. 5562 RICHMOND CA
2004-04-29 510-478-6XXX 6000–6999Assigned METROPCS, INC. 5562 RICHMOND CA
2004-04-29 510-478-7XXX 7000–7999Assigned METROPCS, INC. 5562 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.