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
2016-04-07 916-305-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RSVL CTHT CA
2016-04-07 916-953-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RSVL MAIN CA
2016-04-05 916-461-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C FOLSOM CA
2016-04-05 916-701-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2016-04-05 916-701-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2016-04-05 916-738-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2016-04-05 916-823-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2016-04-05 916-823-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2016-04-05 916-823-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2016-04-05 916-975-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2016-04-05 916-975-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2016-04-01 916-701-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2016-03-31 916-655-8XXX 8000–8999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 PLEASATGRV CA
2016-03-28 916-584-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2016-03-28 916-694-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2016-03-28 916-694-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2016-03-28 916-701-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2016-03-28 916-796-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C RIO LINDA CA
2016-03-28 916-796-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C RIO LINDA CA
2016-03-25 916-579-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2016-03-25 916-579-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2016-03-25 916-963-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FAIR OAKS CA
2016-03-25 916-963-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FAIR OAKS CA
2016-03-25 916-963-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FAIR OAKS CA
2016-03-25 916-963-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FAIR OAKS CA
2016-03-25 916-963-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FAIR OAKS CA
2016-03-14 916-507-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-03-14 916-507-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-03-14 916-507-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-03-14 916-507-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-03-09 916-559-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-03-09 916-559-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-03-09 916-581-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C LINCOLN CA
2016-03-09 916-581-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C LINCOLN CA
2016-03-08 916-738-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 SCRM MAIN CA
2016-03-08 916-738-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 SCRM MAIN CA
2016-02-23 916-975-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SO PLACER CA
2016-02-17 916-702-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C PLEASATGRV CA
2016-02-17 916-702-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C PLEASATGRV CA
2016-02-17 916-794-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C MICHIGNBAR CA
2016-02-17 916-794-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C MICHIGNBAR CA
2016-02-16 916-680-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2016-02-16 916-701-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2016-02-11 916-975-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2016-02-11 916-975-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2016-02-10 916-755-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F RSVL MAIN CA
2016-02-03 916-250-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SO PLACER CA
2016-02-01 916-559-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-02-01 916-559-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-02-01 916-559-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH 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.