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 918
LEVEL 3 COMMUNICATIONS, LLC - OK 182
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
2025-06-12 918-353-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 JAY OK
2024-12-17 918-895-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2022-08-11 918-943-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BIXBY OK
2022-05-06 918-300-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TALIHINA OK
2022-03-04 918-503-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MULDROW OK
2021-09-24 918-635-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 POTEAU OK
2021-06-28 918-279-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COWETA OK
2020-02-13 918-276-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 VINITA OK
2018-08-06 918-498-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WUNIONTOWN OK
2018-06-22 918-792-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RED OAK OK
2017-06-06 918-930-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WESTVILLE OK
2017-05-31 918-528-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 JENKS OK
2017-05-24 918-262-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WATTS OK
2017-05-19 918-410-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STILWELL OK
2017-04-24 918-255-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SOCOFFEYVL OK
2017-03-10 918-475-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ALLUWE OK
2017-03-10 918-969-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BOKOSHE OK
2017-03-08 918-372-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RIPLEY OK
2017-03-07 918-322-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KIEFER OK
2017-03-07 918-736-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HASKELL OK
2017-03-07 918-738-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RALSTON OK
2017-03-07 918-762-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PAWNEE OK
2017-03-07 918-897-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HOMINY OK
2017-03-07 918-983-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MONROEHOWE OK
2017-03-06 918-467-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DELAWARE OK
2017-02-24 918-953-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ADAIR OK
2017-02-22 918-673-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PICHER OK
2017-02-22 918-965-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CLAREMORE OK
2016-10-13 918-390-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SALINA OK
2016-07-28 918-674-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 QUAPAW OK
2016-03-22 918-505-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BROKENARRW OK
2016-01-22 918-974-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 POTEAU OK
2015-12-18 918-900-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2015-12-07 918-387-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 YALE OK
2015-12-07 918-862-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OILTON OK
2015-10-19 918-941-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KELLYVILLE OK
2015-10-15 918-543-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 INOLA OK
2015-09-16 918-703-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2015-08-13 918-940-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BROKENARRW OK
2015-07-27 918-730-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2015-07-14 918-340-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2015-04-13 918-716-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKEMAH OK
2015-01-27 918-529-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WMAYSVILLE OK
2014-12-03 918-626-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CEDARS OK
2014-10-01 918-932-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2014-09-30 918-505-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BROKENARRW OK
2014-09-16 918-816-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MUSKOGEE OK
2014-08-20 918-992-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2014-08-20 918-992-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2014-07-31 918-558-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MCALESTER 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.