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 539
LEVEL 3 COMMUNICATIONS, LLC - OK 55
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
2026-06-30 539-358-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PEGGS OK
2025-12-17 539-371-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DISNEY OK
2024-12-17 539-758-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DEPEW OK
2022-11-02 539-257-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CLEVELAND OK
2022-10-03 539-263-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HENRYETTA OK
2022-03-31 539-270-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENTERPRISE OK
2022-03-31 539-274-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LONGTOWN OK
2022-03-31 539-285-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KEOTA OK
2022-03-31 539-288-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MCCURTAIN OK
2022-03-31 539-339-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KEEFETON OK
2022-03-31 539-398-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WARNER OK
2022-03-02 539-235-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2021-11-08 539-245-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 POCOLA OK
2021-11-08 539-352-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MOFFETT OK
2021-06-30 539-242-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2021-04-20 539-867-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2021-03-15 539-529-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BARTLESVL OK
2021-02-26 539-241-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CHOUTEAU OK
2021-02-23 539-476-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2021-01-25 539-244-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKMULGEE OK
2020-06-30 539-230-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SALLISAW OK
2019-11-15 539-785-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WISTER OK
2019-08-22 539-213-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CAMERON OK
2019-07-12 539-333-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 AFTON OK
2019-02-27 539-220-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HEAVENER OK
2017-12-08 539-229-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ARPELAR OK
2017-12-08 539-899-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STUART OK
2017-10-09 539-225-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GORE OK
2017-10-09 539-227-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KINTA OK
2017-10-09 539-331-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 QUINTON OK
2017-10-09 539-414-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PORUM OK
2017-10-09 539-636-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WEBBERSFLS OK
2017-08-11 539-489-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SNUGHARBOR OK
2017-07-03 539-209-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WAGONER OK
2017-06-07 539-798-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 FLINT OK
2017-05-19 539-819-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BARON OK
2017-04-17 539-328-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COLCORD OK
2017-04-10 539-337-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RAMONA OK
2017-04-10 539-585-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 AVANT OK
2017-03-21 539-215-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2017-03-10 539-200-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BARNSDALL OK
2016-12-30 539-313-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-30 539-313-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA 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.