NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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
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
2014-07-02 510-426-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RICHMOND CA
2014-07-02 510-879-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2014-07-02 510-897-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2014-06-26 510-735-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2014-06-26 510-972-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2014-06-23 510-876-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2014-06-19 510-324-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2014-06-19 510-401-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2014-06-16 510-240-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK GRNLF CA
2014-06-16 510-324-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK GRNLF CA
2014-06-16 510-770-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK OLIVR CA
2014-06-16 510-771-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK OLIVR CA
2014-06-16 510-897-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J FRNK OLIVR CA
2014-06-13 510-876-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2014-06-04 510-224-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HRCUL-RODE CA
2014-06-04 510-455-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CROCKETT CA
2014-06-04 510-935-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-06-02 510-365-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-06-02 510-365-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-06-02 510-365-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-05-30 510-556-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2014-05-30 510-556-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2014-05-30 510-556-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2014-05-30 510-556-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2014-05-30 510-556-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2014-05-30 510-556-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2014-05-23 510-788-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2014-05-19 510-722-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CROCKETT CA
2014-05-19 510-877-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2014-05-19 510-877-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2014-05-19 510-904-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2014-05-15 510-907-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2014-05-12 510-803-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HRCUL-RODE CA
2014-05-12 510-990-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-05-09 510-990-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2014-05-08 510-897-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2014-05-06 510-823-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C OKLD MN-PD CA
2014-05-05 510-556-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2014-05-01 510-876-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2014-05-01 510-877-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2014-04-30 510-480-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2014-04-25 510-426-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2014-04-18 510-296-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HRCUL-RODE CA
2014-04-10 510-362-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2014-04-04 510-298-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2014-04-04 510-320-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2014-04-04 510-598-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2014-04-01 510-878-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C OKLD TRNID CA
2014-03-31 510-426-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2014-03-31 510-426-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND 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.