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
2005-12-27 510-495-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2005-12-21 510-691-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HRCUL-RODE CA
2005-12-21 510-921-4XXX 4000–4999Assigned METROPCS, INC. 5562 HAYWARD CA
2005-12-16 510-824-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2005-12-14 510-846-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2005-12-13 510-275-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2005-12-13 510-439-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2005-12-13 510-722-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CROCKETT CA
2005-12-06 510-457-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2005-12-06 510-457-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2005-12-05 510-921-6XXX 6000–6999Assigned METROPCS, INC. 5562 HAYWARD CA
2005-11-30 510-307-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2005-11-23 510-862-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2005-11-21 510-287-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2005-11-21 510-343-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2005-11-21 510-343-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2005-11-11 510-690-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2005-11-02 510-452-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2005-10-28 510-921-9XXX 9000–9999Assigned METROPCS, INC. 5562 HAYWARD CA
2005-10-27 510-395-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD FRTVL CA
2005-10-05 510-690-3XXX 3000–3999Assigned METROPCS, INC. 5562 HAYWARD CA
2005-10-05 510-857-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2005-09-23 510-493-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2005-09-23 510-529-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2005-09-23 510-529-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2005-09-23 510-529-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2005-09-23 510-856-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2005-09-23 510-856-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2005-09-23 510-856-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2005-09-15 510-270-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2005-09-15 510-270-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2005-09-14 510-457-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2005-09-12 510-323-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2005-09-12 510-789-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2005-09-12 510-789-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2005-09-07 510-259-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2005-08-26 510-629-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2005-08-26 510-629-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2005-08-26 510-629-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2005-08-23 510-269-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2005-08-23 510-350-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2005-08-23 510-474-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2005-08-23 510-972-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2005-08-23 510-991-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2005-08-23 510-991-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2005-08-18 510-257-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK OLIVR CA
2005-08-18 510-257-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK OLIVR CA
2005-08-18 510-257-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK OLIVR CA
2005-08-18 510-257-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK OLIVR CA
2005-08-18 510-263-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD ALMD 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.