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 501
COMCAST IP PHONE, LLC 58
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
2025-07-14 501-427-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MAUMELLE AR
2025-05-30 501-770-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WRIGHTSVL AR
2025-03-26 501-314-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J GREENBRIER AR
2025-03-26 501-518-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DAMASCUS AR
2025-03-26 501-524-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J VILONIA AR
2025-03-13 501-576-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CONWAY AR
2023-05-02 501-491-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BEEBE AR
2023-04-27 501-480-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2023-04-27 501-480-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2023-04-27 501-480-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2023-04-27 501-480-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2022-04-08 501-522-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J BENTON AR
2021-09-08 501-446-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CABOT AR
2018-02-07 501-271-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PALARM AR
2016-06-08 501-904-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-06-08 501-904-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-06-08 501-904-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-03-31 501-406-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-03-02 501-476-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2015-10-28 501-457-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J JACKSONVL AR
2015-08-31 501-891-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2015-08-28 501-864-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J SYVNHLSHWD AR
2015-06-05 501-904-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2015-04-15 501-481-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BRYANTCGVL AR
2015-03-12 501-817-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J FERNDALE AR
2014-10-15 501-503-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2014-06-27 501-673-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PINNACLE AR
2014-04-08 501-725-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2013-12-10 501-725-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2013-10-08 501-819-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SYVNHLSHWD AR
2013-09-04 501-420-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2012-07-26 501-916-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2012-07-26 501-916-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2012-06-18 501-983-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J JACKSONVL AR
2012-05-09 501-812-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2012-02-17 501-313-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2011-10-21 501-313-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2011-08-12 501-400-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2009-10-14 501-414-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2008-09-22 501-319-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2007-09-17 501-414-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2007-06-20 501-392-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SYVNHLSHWD AR
2007-06-07 501-737-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SCOTT AR
2007-04-26 501-379-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2007-04-26 501-379-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2007-04-12 501-246-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2007-02-06 501-457-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J JACKSONVL AR
2006-09-22 501-246-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2006-09-22 501-246-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2006-06-05 501-353-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR

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.