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
2010-03-09 510-574-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2010-03-08 510-413-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J FRNK OLIVR CA
2010-03-08 510-740-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2010-03-03 510-872-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2010-02-22 510-470-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-02-22 510-470-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-02-22 510-730-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-02-22 510-730-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-02-22 510-730-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-02-19 510-397-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2010-02-18 510-270-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2010-02-17 510-984-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2010-02-09 510-460-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2010-02-06 510-936-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-02-06 510-936-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-02-04 510-725-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2010-02-02 510-313-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HRCUL-RODE CA
2010-02-01 510-863-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2010-02-01 510-863-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2010-02-01 510-863-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2010-01-28 510-213-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2010-01-28 510-224-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HRCUL-RODE CA
2010-01-28 510-269-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2010-01-28 510-274-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-01-28 510-342-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-01-28 510-408-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSBR-PINL CA
2010-01-28 510-408-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSBR-PINL CA
2010-01-28 510-485-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2010-01-28 510-686-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2010-01-28 510-936-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2010-01-28 510-936-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2010-01-28 510-936-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2010-01-27 510-240-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2010-01-27 510-413-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2010-01-27 510-423-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-01-27 510-457-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-01-27 510-463-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-01-27 510-788-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-01-27 510-852-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-01-22 510-899-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2010-01-15 510-307-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RICHMOND CA
2010-01-08 510-342-1XXX 1000–1999Assigned AT&T - LOCAL 7421 HAYWARD CA
2009-12-30 510-394-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 OKLD TRNID CA
2009-12-29 510-379-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2009-12-10 510-227-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J OKLD ALMD CA
2009-11-25 510-408-0XXX 0000–0999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-1XXX 1000–1999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-2XXX 2000–2999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-3XXX 3000–3999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-4XXX 4000–4999Assigned PACIFIC BELL 9740 ELSBR-PINL 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.