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 279
COMCAST PHONE OF CALIFORNIA, LLC 13
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
2024-08-01 279-587-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PLEASATGRV CA
2022-06-09 279-966-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LINCOLN CA
2020-09-20 279-529-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RSVL CTHT CA
2020-09-20 279-529-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RSVL CTHT CA
2020-09-16 279-345-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2020-09-16 279-345-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2020-09-16 279-345-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2020-09-16 279-345-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2020-09-16 279-345-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2019-06-05 279-900-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RSVL MAIN CA
2019-04-11 279-777-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2019-04-02 279-222-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2018-05-14 279-333-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELK GROVE 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.