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
2014-09-10 510-680-4XXX 4000–4999Assigned METROPCS, INC. 5562 RICHMOND CA
2014-09-10 510-829-6XXX 6000–6999Assigned METROPCS, INC. 5562 RICHMOND CA
2014-09-10 510-829-7XXX 7000–7999Assigned METROPCS, INC. 5562 RICHMOND CA
2014-09-10 510-829-8XXX 8000–8999Assigned METROPCS, INC. 5562 RICHMOND CA
2014-09-10 510-838-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD FRTVL CA
2014-09-04 510-671-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2014-09-04 510-871-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2014-09-04 510-871-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2014-09-04 510-871-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2014-09-04 510-871-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2014-08-29 510-829-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2014-08-29 510-829-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2014-08-29 510-829-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2014-08-29 510-833-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2014-08-29 510-935-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-08-29 510-935-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-08-29 510-935-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-08-29 510-935-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-08-29 510-953-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2014-08-29 510-953-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2014-08-29 510-953-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2014-08-27 510-480-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2014-08-27 510-935-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2014-08-27 510-935-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2014-08-22 510-556-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2014-08-22 510-953-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J FRNK MAIN CA
2014-08-21 510-876-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2014-08-18 510-328-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2014-08-18 510-829-9XXX 9000–9999Assigned METROPCS, INC. 5562 RICHMOND CA
2014-08-12 510-833-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2014-08-06 510-426-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-08-06 510-426-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-08-06 510-426-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-08-06 510-426-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2014-08-06 510-592-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HRCUL-RODE CA
2014-08-06 510-592-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HRCUL-RODE CA
2014-07-28 510-833-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD BKLY CA
2014-07-28 510-871-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2014-07-22 510-952-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK GRNLF CA
2014-07-21 510-426-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2014-07-21 510-935-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-07-17 510-556-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2014-07-17 510-990-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2014-07-15 510-560-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2014-07-14 510-365-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2014-07-14 510-876-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2014-07-14 510-876-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2014-07-14 510-876-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2014-07-09 510-935-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAYWARD CA
2014-07-03 510-480-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E 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.