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 408
COMCAST PHONE OF CALIFORNIA, LLC 94
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
2020-09-18 408-366-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2020-09-18 408-387-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2020-09-18 408-549-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2020-09-18 408-567-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2020-09-18 408-625-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2020-09-18 408-792-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2018-11-15 408-703-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2018-04-30 408-882-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2017-12-05 408-622-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2016-08-25 408-721-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SUNNYVALE CA
2014-09-04 408-212-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SUNNYVALE CA
2014-07-01 408-442-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS GATOS CA
2014-01-10 408-898-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SARATOGA CA
2013-11-13 408-809-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2013-09-06 408-708-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2013-08-15 408-819-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CAMPBELL CA
2013-08-13 408-816-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2013-08-13 408-816-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2013-08-12 408-809-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2013-05-07 408-560-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS GATOS CA
2013-04-25 408-680-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CAMPBELL CA
2013-04-08 408-618-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2013-02-08 408-784-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2012-12-11 408-606-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2012-10-22 408-610-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2012-08-16 408-620-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2012-01-26 408-638-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2011-09-22 408-326-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2011-09-08 408-884-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS GATOS CA
2011-09-02 408-412-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CAMPBELL CA
2011-09-02 408-708-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2011-08-18 408-477-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2011-08-12 408-708-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2011-08-01 408-498-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SUNNYVALE CA
2011-07-22 408-440-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2011-05-05 408-960-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2011-04-21 408-900-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SUNNYVALE CA
2010-12-06 408-340-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CAMPBELL CA
2010-11-12 408-380-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2010-11-12 408-645-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2010-08-18 408-753-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2010-08-06 408-827-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS GATOS CA
2010-06-29 408-684-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2010-05-26 408-462-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SUNNYVALE CA
2010-05-05 408-320-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2010-01-27 408-622-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2010-01-27 408-622-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2010-01-27 408-622-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2009-09-03 408-960-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2009-08-26 408-770-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH 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.