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
2014-03-17 925-819-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DUBLN-SNRM CA
2014-03-13 925-278-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WALNUT CRK CA
2014-03-12 925-438-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ORINDA CA
2014-03-12 925-635-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PITTSBURG CA
2014-03-05 925-326-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2014-03-05 925-557-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DUBLN-SNRM CA
2014-03-03 925-317-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORINDA CA
2014-03-03 925-319-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNOL CA
2014-03-03 925-621-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLEASANTON CA
2014-03-03 925-621-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLEASANTON CA
2014-02-28 925-326-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CONCORD CA
2014-02-28 925-403-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LAFAYETTE CA
2014-02-28 925-579-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LIVERMORE CA
2014-02-28 925-579-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LIVERMORE CA
2014-02-28 925-587-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DUBLN-SNRM CA
2014-02-28 925-587-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUBLN-SNRM CA
2014-02-28 925-587-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DUBLN-SNRM CA
2014-02-28 925-679-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ECONTRCOST CA
2014-02-28 925-718-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DANVILLE CA
2014-02-28 925-718-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DANVILLE CA
2014-02-28 925-732-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANTIOCH CA
2014-02-28 925-755-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANTIOCH CA
2014-02-28 925-871-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LAFAYETTE CA
2014-02-12 925-278-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2014-02-12 925-278-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2014-02-12 925-732-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2014-02-07 925-626-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ECONTRCOST CA
2014-01-27 925-275-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C BSHP RNCH CA
2014-01-23 925-391-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2014-01-21 925-475-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PLEASANTON CA
2014-01-21 925-568-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SUNOL CA
2014-01-14 925-316-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MARTINEZ CA
2014-01-07 925-428-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2013-12-16 925-278-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2013-12-13 925-278-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WALNUT CRK CA
2013-12-12 925-278-9XXX 9000–9999Assigned METROPCS, INC. 5562 WALNUT CRK CA
2013-12-10 925-278-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WALNUT CRK CA
2013-12-10 925-391-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C CONCORD CA
2013-12-10 925-523-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PLEASANTON CA
2013-12-10 925-724-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LIVERMORE CA
2013-12-10 925-724-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LIVERMORE CA
2013-12-10 925-964-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DANVILLE CA
2013-12-09 925-391-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CONCORD CA
2013-12-09 925-391-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CONCORD CA
2013-12-09 925-391-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CONCORD CA
2013-12-05 925-428-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ANTIOCH CA
2013-11-25 925-391-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CONCORD CA
2013-11-21 925-549-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DUBLN-SNRM CA
2013-11-21 925-549-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DUBLN-SNRM CA
2013-11-08 925-428-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANTIOCH 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.