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
2016-10-03 916-345-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2016-10-03 916-345-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2016-10-03 916-545-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2016-10-03 916-545-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2016-09-30 916-260-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FOLSOM CA
2016-09-26 916-345-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-09-26 916-345-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-09-26 916-399-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2016-09-26 916-892-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ELK GROVE CA
2016-09-23 916-465-7XXX 7000–7999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 SCRM MAIN CA
2016-09-23 916-465-8XXX 8000–8999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 SCRM MAIN CA
2016-09-23 916-886-2XXX 2000–2999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 RSVL MAIN CA
2016-09-23 916-886-5XXX 5000–5999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 RSVL MAIN CA
2016-09-21 916-260-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FOLSOM CA
2016-09-20 916-305-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RSVL CTHT CA
2016-09-16 916-280-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ELK GROVE CA
2016-09-16 916-280-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ELK GROVE CA
2016-09-16 916-280-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ELK GROVE CA
2016-09-15 916-515-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SCRM NORTH CA
2016-09-13 916-963-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FAIR OAKS CA
2016-08-29 916-432-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F RIO LINDA CA
2016-08-25 916-883-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-08-25 916-883-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-08-25 916-883-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-08-25 916-883-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-08-25 916-883-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM NORTH CA
2016-08-24 916-884-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LINCOLN CA
2016-08-22 916-280-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ELK GROVE CA
2016-08-22 916-439-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FOLSOM CA
2016-08-22 916-545-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FAIR OAKS CA
2016-08-12 916-250-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C SO PLACER CA
2016-08-12 916-675-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIO LINDA CA
2016-08-12 916-992-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIO LINDA CA
2016-08-04 916-755-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RSVL MAIN CA
2016-08-02 916-280-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ELK GROVE CA
2016-08-02 916-633-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FAIR OAKS CA
2016-08-02 916-656-6XXX 6000–6999Assigned HD CARRIER LLC 321J PLEASATGRV CA
2016-08-02 916-656-8XXX 8000–8999Assigned HD CARRIER LLC 321J PLEASATGRV CA
2016-08-02 916-702-0XXX 0000–0999Assigned HD CARRIER LLC 321J PLEASATGRV CA
2016-08-02 916-702-2XXX 2000–2999Assigned HD CARRIER LLC 321J PLEASATGRV CA
2016-08-02 916-883-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SCRM NORTH CA
2016-07-29 916-250-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SO PLACER CA
2016-07-26 916-461-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FOLSOM CA
2016-07-26 916-562-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2016-07-26 916-562-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2016-07-26 916-562-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2016-07-26 916-562-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2016-07-26 916-562-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2016-07-26 916-562-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2016-07-26 916-701-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 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.