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
2013-07-24 510-877-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2013-07-15 510-417-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2013-07-10 510-362-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2013-06-27 510-362-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2013-06-26 510-646-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2013-06-21 510-362-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2013-06-21 510-362-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2013-06-21 510-680-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2013-06-12 510-543-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2013-06-11 510-328-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2013-06-11 510-646-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2013-06-03 510-680-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RICHMOND CA
2013-05-31 510-598-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2013-05-28 510-404-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FRNK GRNLF CA
2013-05-28 510-469-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OKLD MN-PD CA
2013-05-28 510-598-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FRNK MAIN CA
2013-05-28 510-646-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OKLD BKLY CA
2013-05-28 510-824-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FRNK OLIVR CA
2013-05-24 510-447-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2013-05-22 510-598-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2013-05-22 510-598-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2013-05-20 510-362-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2013-05-15 510-866-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD FRTVL CA
2013-05-14 510-646-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2013-05-14 510-671-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2013-05-14 510-671-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2013-05-10 510-398-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J HAYWARD CA
2013-05-08 510-210-6XXX 6000–6999Assigned SONIC TELECOM, LLC - CA 433E RICHMOND CA
2013-05-08 510-340-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2013-05-08 510-359-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2013-05-08 510-359-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HAYWARD CA
2013-05-08 510-473-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2013-05-08 510-598-1XXX 1000–1999Assigned SONIC TELECOM, LLC - CA 433E FRNK MAIN CA
2013-05-08 510-764-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2013-05-07 510-573-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK OLIVR CA
2013-05-01 510-210-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2013-04-29 510-283-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2013-04-25 510-598-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2013-04-16 510-298-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2013-04-16 510-335-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2013-04-10 510-210-4XXX 4000–4999Assigned METROPCS, INC. 5562 RICHMOND CA
2013-04-10 510-328-2XXX 2000–2999Assigned METROPCS, INC. 5562 OKLD FRTVL CA
2013-04-10 510-646-2XXX 2000–2999Assigned METROPCS, INC. 5562 OKLD BKLY CA
2013-04-05 510-306-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2013-04-05 510-306-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2013-04-05 510-761-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2013-04-05 510-761-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2013-04-05 510-761-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2013-04-04 510-403-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2013-04-04 510-957-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID 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.