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 531
LEVEL 3 COMMUNICATIONS, LLC - NE 49
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
2023-02-10 531-400-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 COLUMBUS NE
2023-02-07 531-533-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 GUIDE ROCK NE
2023-01-18 531-315-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 BLAIR NE
2023-01-03 531-307-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 HOMER NE
2023-01-03 531-314-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 W HAMBURG NE
2022-12-30 531-252-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 CRESTON NE
2022-12-30 531-275-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 HOWELLS NE
2022-12-30 531-297-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 WAKEFIELD NE
2022-12-30 531-776-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 AINSWORTH NE
2022-12-19 531-246-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 SUPERIOR NE
2022-12-14 531-306-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 MURRAY NE
2022-11-16 531-305-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 HICKMAN NE
2022-11-09 531-295-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LAUREL NE
2022-08-09 531-286-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OAKLAND NE
2022-04-18 531-291-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 CRETE NE
2021-10-04 531-271-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 O NEILL NE
2021-07-07 531-910-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-06-10 531-263-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-05-05 531-263-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-05-03 531-268-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 ATKINSON NE
2021-03-12 531-272-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2021-02-11 531-559-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2020-10-21 531-800-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2019-08-20 531-625-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 SOSIOUX CY NE
2019-06-25 531-239-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2019-03-19 531-213-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2018-05-02 531-484-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2018-05-02 531-484-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2018-03-08 531-484-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2017-09-29 531-207-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LINCOLN NE
2017-06-20 531-218-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LINCOLN NE
2017-01-25 531-215-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2016-12-30 531-220-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LINCOLN NE
2016-12-06 531-301-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2016-06-01 531-500-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LINCOLN NE
2015-11-04 531-329-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2015-09-29 531-203-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2015-09-01 531-203-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2015-08-05 531-289-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LINCOLN NE
2015-07-23 531-600-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2015-07-08 531-289-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LINCOLN NE

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.