NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 405
LEVEL 3 COMMUNICATIONS, LLC - OK 184
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
2025-10-27 405-864-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CASHION OK
2024-02-02 405-349-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LUTHER OK
2024-02-02 405-807-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 NICOMAPARK OK
2024-02-02 405-860-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PADEN OK
2023-06-28 405-538-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KINGFISHER OK
2023-03-21 405-764-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2022-06-16 405-483-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 UNION CITY OK
2022-06-15 405-442-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PURCELL OK
2022-02-04 405-865-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CARNEY OK
2021-12-29 405-666-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2021-10-13 405-399-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 JONES OK
2021-07-28 405-871-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2020-10-02 405-832-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRITTON OK
2020-09-01 405-242-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRITTON OK
2020-09-01 405-242-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRITTON OK
2020-08-25 405-453-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 VERDEN OK
2020-08-12 405-477-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MEEKER OK
2020-06-25 405-877-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GUTHRIE OK
2020-05-29 405-674-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MUSTANG OK
2020-03-23 405-868-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BETHANY OK
2020-02-20 405-890-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STELLA OK
2020-02-18 405-846-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TRIBBEY OK
2020-02-13 405-988-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MCLOUD OK
2020-02-12 405-342-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ARCADIA OK
2019-02-14 405-597-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BLANCHARD OK
2019-02-14 405-852-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 NEWCASTLE OK
2019-02-14 405-903-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DIBBLE OK
2019-02-07 405-281-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CHOCTAW OK
2018-12-13 405-594-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2018-08-07 405-666-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2018-08-07 405-666-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2017-08-22 405-718-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 NEWALLA OK
2017-08-22 405-988-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MCLOUD OK
2017-08-02 405-500-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2017-01-05 405-493-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2016-09-06 405-581-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 EARLSBORO OK
2016-03-16 405-438-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2016-03-16 405-832-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRITTON OK
2015-09-23 405-491-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BETHANY OK
2015-09-04 405-252-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRITTON OK
2015-08-26 405-669-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2015-08-13 405-855-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MIDWEST CY OK
2015-07-27 405-968-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2015-07-14 405-754-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2015-07-06 405-754-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2015-04-28 405-546-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2014-10-01 405-546-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2014-10-01 405-546-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
2014-09-30 405-300-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MOORE OK
2014-09-30 405-531-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 EDMOND OK

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.