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 858
COMCAST PHONE OF CALIFORNIA, LLC 92
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
2019-12-09 858-988-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
2019-11-26 858-303-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-08-29 858-296-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-08-29 858-296-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-07-30 858-294-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CHULAVISTA CA
2019-07-30 858-294-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CHULAVISTA CA
2019-01-15 858-302-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2017-11-28 858-214-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2017-10-04 858-302-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2017-09-29 858-282-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG MRMS CA
2017-09-29 858-524-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOBRNDO CA
2017-09-29 858-883-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2017-09-29 858-914-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOSANFE CA
2017-09-28 858-209-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DEL MAR CA
2017-03-03 858-285-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2017-02-24 858-283-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2017-02-24 858-883-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2017-01-23 858-221-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2016-04-26 858-299-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DEL MAR CA
2016-03-24 858-203-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2015-10-27 858-987-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2015-09-30 858-376-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOBRNDO CA
2015-07-22 858-987-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2015-06-08 858-376-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOBRNDO CA
2015-03-17 858-295-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2014-06-11 858-266-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2014-06-06 858-352-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2014-06-04 858-864-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2014-04-02 858-536-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG MRMS CA
2013-10-14 858-832-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOSANFE CA
2013-09-19 858-842-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2013-06-21 858-935-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG MRMS CA
2013-03-11 858-256-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA 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.