NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 531
CENTURYLINK COMMUNICATIONS, LLC 32
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2021-05-28 531-263-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2019-03-13 531-213-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-10-08 531-226-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2017-10-18 531-375-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2017-07-19 531-218-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LINCOLN NE
2017-05-01 531-208-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ATKINSON NE
2017-02-16 531-365-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2017-02-16 531-365-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-10-17 531-301-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-05-24 531-300-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CRESTON NE
2016-05-24 531-571-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WAKEFIELD NE
2016-03-21 531-355-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-03-21 531-355-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2015-01-20 531-202-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OAKLAND NE
2013-02-13 531-333-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LINCOLN NE

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.