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 580
LEVEL 3 COMMUNICATIONS, LLC - OK 145
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
2026-05-29 580-587-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RATTAN OK
2026-05-14 580-631-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BEAVER OK
2026-05-14 580-709-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HOOKER OK
2026-04-30 580-817-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TEXHOMA OK
2026-04-09 580-586-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WAURIKA OK
2026-04-09 580-602-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HOLLIS OK
2026-04-01 580-997-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CHEROKEE OK
2025-10-27 580-750-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MEDFORD OK
2024-01-12 580-400-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LAWTON OK
2023-10-06 580-492-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ELGIN OK
2023-05-31 580-969-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HUGO OK
2023-04-28 580-791-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WATONGA OK
2023-01-24 580-787-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BOISE CITY OK
2023-01-18 580-707-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENID OK
2022-07-15 580-754-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GUYMON OK
2022-06-29 580-779-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HELENA OK
2022-06-16 580-961-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STRINGTOWN OK
2020-09-01 580-745-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DURANT OK
2020-04-29 580-200-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CADDO OK
2019-12-02 580-710-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PERRY OK
2019-06-05 580-562-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BURNS FLAT OK
2019-06-04 580-218-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRECKENRDG OK
2019-06-04 580-260-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WAUKOMIS OK
2019-06-04 580-268-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MARLAND OK
2019-06-04 580-288-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KREMLIN OK
2019-06-04 580-329-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CARRIER OK
2019-06-04 580-345-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SOPER OK
2019-06-04 580-358-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 FAIRMONT OK
2019-06-04 580-403-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STRATFORD OK
2019-06-04 580-405-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ALLEN OK
2019-06-04 580-412-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 FAIRVIEW OK
2019-06-04 580-416-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MORRISON OK
2019-06-04 580-422-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BILLINGS OK
2019-06-04 580-450-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WALTERS OK
2019-06-04 580-635-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HILLSDALE OK
2019-06-04 580-648-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OLUSTEE OK
2019-06-04 580-669-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GLENCOE OK
2019-06-04 580-693-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COMANCHE OK
2019-06-04 580-723-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RED ROCK OK
2019-06-04 580-738-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HEADRICK OK
2018-10-08 580-418-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 FREDERICK OK
2017-12-11 580-980-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CALERA OK
2017-12-08 580-691-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CARTWRIGHT OK
2017-12-08 580-714-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ACHILLE OK
2017-12-08 580-733-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BOKCHITO OK
2017-12-08 580-942-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COLBERT OK
2017-08-21 580-754-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GUYMON OK
2017-01-12 580-341-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ARDMORE OK
2016-09-19 580-217-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WILSON OK
2015-10-27 580-265-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STONEWALL OK

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.