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
LEVEL 3 COMMUNICATIONS, LLC - AR 132
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
2023-10-09 501-546-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 FAIRFLD BY AR
2023-09-28 501-544-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SHIRLEY AR
2022-12-07 501-453-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 JACKSONVL AR
2022-11-22 501-330-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 WYE AR
2022-02-24 501-699-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SCOTLAND AR
2022-02-23 501-757-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CLINTON AR
2020-07-28 501-431-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOTSPRINGS AR
2020-05-05 501-403-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTON AR
2019-12-17 501-273-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CONWAY AR
2019-07-09 501-514-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CONWAY AR
2019-03-28 501-338-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BISMARCK AR
2019-03-28 501-357-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 DONALDSON AR
2019-01-14 501-274-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2019-01-14 501-274-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2018-07-31 501-331-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PERRYVILLE AR
2018-06-01 501-424-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CABOT AR
2017-08-31 501-435-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2017-08-18 501-939-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LONSDALE AR
2017-08-18 501-991-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CRYSTALSPG AR
2017-05-18 501-916-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2016-06-28 501-575-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTON AR
2015-12-02 501-781-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOTSPRINGS AR
2015-10-02 501-486-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SPRINGLAKE AR
2015-09-24 501-239-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BEEBE AR
2015-09-24 501-508-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2015-09-15 501-316-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTON AR
2015-09-15 501-800-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PALARM AR
2015-07-21 501-507-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTON AR
2015-07-21 501-904-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2015-07-20 501-486-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SPRINGLAKE AR
2015-06-26 501-417-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 JUDSONIA AR
2015-06-19 501-299-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 KENSETT AR
2015-06-19 501-530-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BALD KNOB AR
2015-01-13 501-509-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 COY AR
2014-12-12 501-662-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PERRY AR
2014-12-11 501-335-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 DAMASCUS AR
2014-12-09 501-345-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PLEASANTPL AR
2014-12-05 501-323-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 GRIFFITHVL AR
2014-12-05 501-344-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BRADFORD AR
2014-11-06 501-200-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 REDFIELD AR
2014-11-06 501-285-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 ENGLAND AR
2014-11-06 501-434-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 MCRAE AR
2014-09-25 501-358-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CONWAY AR
2014-09-25 501-508-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2014-09-25 501-508-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2014-09-25 501-781-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOTSPRINGS AR
2014-08-15 501-508-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2014-07-02 501-725-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2014-04-24 501-725-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2014-03-31 501-523-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SCOTT 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.