NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 231
COMCAST IP PHONE, LLC 28
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
2022-10-27 231-296-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J FREMONT MI
2020-10-19 231-531-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2020-10-19 231-900-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2017-03-22 231-246-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2017-01-09 231-246-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2015-12-23 231-246-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2015-10-21 231-375-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2015-03-17 231-375-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2014-01-22 231-375-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2013-05-06 231-766-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2012-02-10 231-766-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-11-19 231-853-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J RAVENNA MI
2008-11-19 231-981-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WHITEHALL MI
2008-08-28 231-760-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-08-28 231-760-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-08-28 231-760-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-01-11 231-452-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J NEWAYGO MI
2008-01-03 231-457-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-01-03 231-563-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2007-05-08 231-288-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2007-05-08 231-335-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J FREMONT MI
2007-05-08 231-366-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J FRUITPORT MI
2007-05-08 231-821-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HOLTON MI
2007-05-08 231-828-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TWIN LAKE MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.