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
2010-08-17 510-509-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-08-10 510-408-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSBR-PINL CA
2010-08-10 510-470-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-08-10 510-479-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2010-08-10 510-545-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2010-08-10 510-606-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2010-08-10 510-666-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-08-09 510-408-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2010-08-06 510-379-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2010-08-03 510-306-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2010-07-30 510-256-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CROCKETT CA
2010-07-15 510-256-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C CROCKETT CA
2010-07-08 510-984-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2010-07-06 510-509-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2010-06-30 510-470-2XXX 2000–2999Assigned METROPCS, INC. 5562 HAYWARD CA
2010-06-30 510-470-8XXX 8000–8999Assigned METROPCS, INC. 5562 HAYWARD CA
2010-06-23 510-567-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C OKLD TRNID CA
2010-06-18 510-460-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HAYWARD CA
2010-06-15 510-505-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-06-15 510-529-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2010-06-15 510-574-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2010-06-11 510-404-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2010-06-09 510-460-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C HAYWARD CA
2010-06-03 510-460-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2010-06-03 510-460-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2010-05-26 510-470-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2010-05-26 510-470-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-05-26 510-470-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-05-26 510-470-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2010-05-26 510-497-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2010-05-26 510-698-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2010-05-26 510-730-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2010-05-26 510-878-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2010-05-26 510-878-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2010-05-26 510-924-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2010-05-26 510-936-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2010-05-26 510-936-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2010-05-26 510-984-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD BKLY CA
2010-05-26 510-985-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-05-26 510-986-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2010-05-20 510-460-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2010-05-17 510-460-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J HAYWARD CA
2010-05-05 510-460-2XXX 2000–2999Assigned METROPCS, INC. 5562 HAYWARD CA
2010-04-23 510-460-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HAYWARD CA
2010-04-19 510-263-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD ALMD CA
2010-04-15 510-574-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2010-04-15 510-936-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2010-04-13 510-878-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2010-03-26 510-283-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2010-03-23 510-460-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD 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.