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
2014-03-31 510-876-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HAYWARD CA
2014-03-31 510-935-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-03-17 510-306-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2014-03-14 510-671-9XXX 9000–9999Assigned IP HORIZON LLC 515J OKLD ALMD CA
2014-03-12 510-838-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OKLD FRTVL CA
2014-03-12 510-877-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OKLD TRNID CA
2014-03-11 510-320-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2014-03-11 510-320-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2014-03-05 510-320-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2014-03-05 510-619-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2014-03-05 510-736-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2014-03-04 510-365-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-02-28 510-256-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CROCKETT CA
2014-02-28 510-480-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELSBR-PINL CA
2014-02-28 510-671-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OKLD ALMD CA
2014-02-28 510-838-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2014-02-26 510-210-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-02-26 510-210-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-02-26 510-680-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-02-25 510-327-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HRCUL-RODE CA
2014-02-25 510-328-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2014-02-25 510-353-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2014-02-25 510-683-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2014-02-25 510-736-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2014-02-25 510-736-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2014-02-25 510-736-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2014-02-25 510-736-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2014-02-25 510-736-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2014-02-25 510-736-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2014-02-25 510-927-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2014-02-12 510-736-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2014-02-03 510-808-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2014-02-03 510-987-5XXX 5000–5999Assigned PACIFIC BELL 9740 OKLD MN-PD CA
2014-01-27 510-480-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2014-01-23 510-365-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-01-17 510-671-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2014-01-16 510-404-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK GRNLF CA
2014-01-13 510-320-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2014-01-09 510-365-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2013-12-16 510-593-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD MN-PD CA
2013-12-09 510-736-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2013-12-05 510-480-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2013-12-05 510-646-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2013-12-05 510-680-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2013-12-04 510-320-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2013-12-04 510-328-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD FRTVL CA
2013-12-04 510-466-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2013-12-04 510-671-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2013-12-02 510-852-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2013-11-11 510-365-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY 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.