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 312
COMCAST IP PHONE, LLC 39
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
2019-12-06 312-528-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2018-05-24 312-392-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2018-04-02 312-312-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2017-10-03 312-579-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2016-08-19 312-796-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2016-03-21 312-366-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2015-09-04 312-837-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2015-07-02 312-989-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2015-03-18 312-248-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-12-15 312-374-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-10-09 312-982-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-06-16 312-763-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-05-14 312-763-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-05-14 312-763-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-04-01 312-600-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2013-12-17 312-374-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2013-09-06 312-754-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-12-17 312-374-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-12-17 312-374-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-12-17 312-988-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-08-21 312-600-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-08-21 312-888-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-02-10 312-888-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-02-10 312-888-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2011-08-18 312-465-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2011-05-06 312-291-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2011-05-06 312-344-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2010-12-17 312-496-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2010-05-27 312-291-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2008-08-27 312-846-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2008-05-09 312-526-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2007-08-01 312-624-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2007-08-01 312-624-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-11-21 312-929-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-11-21 312-929-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-11-21 312-929-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-07-14 312-265-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-07-14 312-265-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2001-05-21 312-846-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL

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.