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 925
COMCAST PHONE OF CALIFORNIA, LLC 122
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
2023-05-19 925-546-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2023-05-19 925-546-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2023-05-19 925-546-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2023-05-19 925-546-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2023-01-25 925-844-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLAYTON CA
2022-09-21 925-401-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASANTON CA
2022-09-21 925-523-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASANTON CA
2020-09-23 925-533-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2020-09-23 925-533-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2020-09-20 925-215-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2020-09-18 925-775-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ANTIOCH CA
2020-09-18 925-775-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ANTIOCH CA
2020-01-22 925-587-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DUBLN-SNRM CA
2020-01-22 925-758-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2019-10-09 925-430-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2019-04-11 925-403-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LAFAYETTE CA
2019-04-11 925-406-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DANVILLE CA
2018-10-08 925-436-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ANTIOCH CA
2018-07-20 925-249-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASANTON CA
2018-05-30 925-503-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ANTIOCH CA
2018-05-30 925-510-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CONCORD CA
2018-05-14 925-725-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DANVILLE CA
2018-04-27 925-965-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASANTON CA
2017-12-12 925-409-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2017-03-20 925-495-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2017-03-06 925-375-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CONCORD CA
2016-10-17 925-248-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DUBLN-SNRM CA
2016-09-21 925-201-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASANTON CA
2016-08-26 925-390-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ECONTRCOST CA
2015-12-29 925-433-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2015-11-09 925-679-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ECONTRCOST CA
2015-11-02 925-433-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2015-10-30 925-854-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DANVILLE CA
2015-09-24 925-626-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ECONTRCOST CA
2015-08-20 925-393-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2015-07-29 925-374-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MARTINEZ CA
2015-07-27 925-667-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2015-07-16 925-592-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MORAGA CA
2015-04-23 925-483-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CONCORD CA
2015-04-22 925-402-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ORINDA CA
2015-03-30 925-378-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2014-10-31 925-800-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2014-09-22 925-420-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ECONTRCOST CA
2014-07-17 925-448-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2014-07-17 925-481-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ANTIOCH CA
2014-07-02 925-453-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2014-06-24 925-718-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DANVILLE CA
2014-06-20 925-587-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DUBLN-SNRM CA
2014-05-20 925-750-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASANTON CA
2014-04-29 925-201-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L 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.