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
2020-03-16 916-398-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2020-03-16 916-398-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2020-03-10 916-809-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM MAIN CA
2020-03-09 916-251-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SO PLACER CA
2020-03-04 916-860-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FAIR OAKS CA
2020-02-28 916-301-5XXX 5000–5999Assigned METROPCS, INC. 5562 RSVL CTHT CA
2020-02-28 916-301-6XXX 6000–6999Assigned METROPCS, INC. 5562 RSVL CTHT CA
2020-02-28 916-602-6XXX 6000–6999Assigned METROPCS, INC. 5562 ELK GROVE CA
2020-02-28 916-602-7XXX 7000–7999Assigned METROPCS, INC. 5562 ELK GROVE CA
2020-02-28 916-602-8XXX 8000–8999Assigned METROPCS, INC. 5562 ELK GROVE CA
2020-02-21 916-623-9XXX 9000–9999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ISLETON CA
2020-02-13 916-931-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 RIO LINDA CA
2020-02-04 916-398-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C WALNUT GRV CA
2020-02-04 916-398-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C WALNUT GRV CA
2020-02-04 916-665-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C MEADOWVIEW CA
2020-02-04 916-744-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C COURTLAND CA
2020-01-21 916-639-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-21 916-639-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2020-01-10 916-618-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FOLSOM CA
2020-01-09 916-603-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2020-01-09 916-776-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2019-12-20 916-603-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2019-12-19 916-618-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2019-12-19 916-618-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2019-12-19 916-618-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2019-12-02 916-603-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SCRM MAIN CA
2019-11-22 916-618-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FOLSOM CA
2019-11-18 916-886-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RSVL MAIN CA
2019-11-04 916-931-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 RIO LINDA CA
2019-10-09 916-270-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C WALNUT GRV CA
2019-10-09 916-744-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C COURTLAND CA
2019-10-07 916-603-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM MAIN CA
2019-10-07 916-603-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2019-10-07 916-618-0XXX 0000–0999Assigned TELNYX LLC 073H FOLSOM CA
2019-10-07 916-618-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FOLSOM CA
2019-09-27 916-450-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-09-26 916-270-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2019-09-26 916-270-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 WALNUT GRV CA
2019-09-26 916-526-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FAIR OAKS CA
2019-09-25 916-602-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-09-25 916-618-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FOLSOM CA
2019-09-17 916-603-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H SCRM MAIN 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.