NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 916
T-MOBILE USA, INC. 446
ONVOY, LLC - CA 397
NEW CINGULAR WIRELESS PCS, LLC 374
METROPCS, INC. 362
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 331
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
2019-09-06 916-603-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2019-08-22 916-603-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2019-08-09 916-398-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2019-08-07 916-603-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-08-06 916-696-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-08-06 916-944-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-08-06 916-944-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-08-05 916-349-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2019-08-05 916-566-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2019-08-05 916-575-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2019-07-16 916-931-2XXX 2000–2999Assigned TELNYX LLC 073H RIO LINDA CA
2019-07-15 916-312-0XXX 0000–0999Assigned TELNYX LLC 073H MICHIGNBAR CA
2019-07-12 916-894-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM MAIN CA
2019-07-09 916-894-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-09 916-894-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-09 916-894-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-09 916-894-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-09 916-894-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-09 916-894-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-01 916-655-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C PLEASATGRV CA
2019-07-01 916-655-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C PLEASATGRV CA
2019-07-01 916-884-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LINCOLN CA
2019-07-01 916-894-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2019-06-21 916-894-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SCRM MAIN CA
2019-06-18 916-894-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2019-06-14 916-477-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2019-06-14 916-518-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2019-06-14 916-518-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2019-06-10 916-809-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-06-10 916-809-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-06-10 916-809-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-06-10 916-809-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-06-10 916-809-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-06-10 916-809-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-06-10 916-809-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2019-05-24 916-931-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RIO LINDA CA
2019-05-06 916-518-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM NORTH CA
2019-05-02 916-857-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-04-29 916-566-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SCRM NORTH CA
2019-04-11 916-585-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELK GROVE CA
2019-03-19 916-737-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SCRM MAIN CA
2019-03-05 916-413-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FOLSOM CA
2019-03-05 916-674-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C MICHIGNBAR CA
2019-03-05 916-674-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C MICHIGNBAR CA
2019-03-05 916-931-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C RIO LINDA CA
2019-03-05 916-931-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C RIO LINDA CA
2019-02-19 916-270-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2019-02-14 916-301-7XXX 7000–7999Assigned METROPCS, INC. 5562 RSVL CTHT CA
2019-02-08 916-931-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIO LINDA CA
2019-02-08 916-931-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIO LINDA 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.