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
2010-11-16 510-221-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-11-16 510-403-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2010-11-16 510-431-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2010-11-16 510-470-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-11-16 510-922-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-11-16 510-969-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2010-11-16 510-982-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-11-12 510-730-4XXX 4000–4999Assigned METROPCS, INC. 5562 RICHMOND CA
2010-11-12 510-730-5XXX 5000–5999Assigned METROPCS, INC. 5562 RICHMOND CA
2010-11-10 510-509-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-11-10 510-509-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-11-08 510-999-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2010-11-03 510-284-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2010-11-03 510-606-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2010-10-27 510-788-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2010-10-27 510-863-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2010-10-27 510-878-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2010-10-25 510-771-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J FRNK OLIVR CA
2010-10-22 510-999-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2010-10-18 510-509-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2010-10-18 510-509-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2010-10-15 510-606-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-10-15 510-606-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-10-15 510-606-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-10-15 510-606-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-10-14 510-606-2XXX 2000–2999Assigned METROPCS, INC. 5562 HAYWARD CA
2010-10-14 510-606-3XXX 3000–3999Assigned METROPCS, INC. 5562 HAYWARD CA
2010-10-14 510-606-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2010-10-08 510-606-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2010-10-07 510-296-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HRCUL-RODE CA
2010-10-07 510-704-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2010-09-30 510-221-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-09-30 510-221-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-09-30 510-495-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-09-30 510-854-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSBR-PINL CA
2010-09-30 510-854-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSBR-PINL CA
2010-09-30 510-883-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-09-30 510-898-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-09-29 510-259-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HAYWARD CA
2010-09-29 510-509-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK MAIN CA
2010-09-16 510-280-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD BKLY CA
2010-09-16 510-338-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2010-09-08 510-292-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2010-09-03 510-516-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2010-09-02 510-550-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-09-02 510-692-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2010-08-31 510-573-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK OLIVR CA
2010-08-25 510-221-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RICHMOND CA
2010-08-24 510-224-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HRCUL-RODE CA
2010-08-17 510-509-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN 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.