NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

35 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 925
ONVOY, LLC - CA 24
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 5
BANDWIDTH.COM CLEC, LLC - CA 2
TELNYX LLC 1
T-MOBILE USA, INC. 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
2017-05-12 925-597-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PITTSBURG CA
2017-05-09 925-404-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DUBLN-SNRM CA
2017-05-05 925-232-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PSBG WEST CA
2017-05-05 925-532-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2017-05-03 925-807-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BSHP RNCH CA
2017-04-28 925-315-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LIVERMORE CA
2017-04-25 925-690-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CLAYTON CA
2017-04-10 925-495-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LIVERMORE CA
2017-04-07 925-854-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 DANVILLE CA
2017-04-03 925-536-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CONCORD CA
2017-03-23 925-503-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2017-03-22 925-495-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LIVERMORE CA
2017-03-21 925-973-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BSHP RNCH CA
2017-03-20 925-495-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2017-03-20 925-532-0XXX 0000–0999Assigned TELNYX LLC 073H WALNUT CRK CA
2017-03-20 925-536-0XXX 0000–0999Assigned TELNYX LLC 073H CONCORD CA
2017-03-06 925-375-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CONCORD CA
2017-03-06 925-436-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 ANTIOCH CA
2017-03-02 925-214-3XXX 3000–3999Assigned METROPCS, INC. 5562 WALNUT CRK CA
2017-03-02 925-214-6XXX 6000–6999Assigned METROPCS, INC. 5562 WALNUT CRK CA
2017-03-02 925-214-7XXX 7000–7999Assigned METROPCS, INC. 5562 WALNUT CRK CA
2017-03-02 925-495-3XXX 3000–3999Assigned METROPCS, INC. 5562 LIVERMORE CA
2017-02-14 925-862-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SUNOL CA
2017-02-09 925-494-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CONCORD CA
2017-02-06 925-375-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2017-01-20 925-375-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2017-01-20 925-375-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2017-01-18 925-434-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J ANTIOCH CA
2017-01-13 925-306-0XXX 0000–0999Assigned SONIC TELECOM, LLC - CA 433E ECONTRCOST CA
2017-01-13 925-495-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LIVERMORE CA
2017-01-11 925-318-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PITTSBURG CA
2017-01-11 925-374-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MARTINEZ CA
2017-01-11 925-878-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LAFAYETTE CA
2016-12-07 925-214-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WALNUT CRK CA
2016-11-24 925-436-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2016-11-21 925-365-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 BSHP RNCH CA
2016-10-27 925-390-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ECONTRCOST CA
2016-10-24 925-214-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2016-10-24 925-214-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2016-10-24 925-819-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DUBLN-SNRM CA
2016-10-17 925-248-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DUBLN-SNRM CA
2016-10-12 925-436-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2016-10-12 925-436-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2016-10-05 925-214-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WALNUT CRK CA
2016-09-30 925-789-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SUNOL CA
2016-09-28 925-242-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BSHP RNCH CA
2016-09-28 925-247-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C MORAGA CA
2016-09-28 925-258-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C ORINDA CA
2016-09-28 925-297-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C LAFAYETTE CA
2016-09-26 925-623-0XXX 0000–0999Assigned HD CARRIER LLC 321J PLEASANTON 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.