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 406
LEVEL 3 COMMUNICATIONS, LLC - MT 153
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
2026-08-14 406-757-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 DECKER MT
2026-04-23 406-568-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 RYEGATE MT
2026-04-20 406-566-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 STANFORD MT
2026-04-17 406-342-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HYSHAM MT
2026-04-17 406-429-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 WINNETT MT
2026-04-10 406-436-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BROADUS MT
2026-04-10 406-557-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 JORDAN MT
2026-04-10 406-775-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 EKALAKA MT
2025-02-18 406-967-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 WORDEN MT
2025-02-10 406-348-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HUNTLEY MT
2024-12-18 406-312-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BOZEMAN MT
2024-09-23 406-378-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BIG SANDY MT
2024-09-23 406-466-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 CHOTEAU MT
2024-06-18 406-891-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BAKER MT
2024-05-08 406-481-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2024-04-25 406-496-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BUTTE MT
2024-01-02 406-622-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FORTBENTON MT
2023-06-02 406-765-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 PLENTYWOOD MT
2023-04-24 406-405-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 LIBBY MT
2023-03-08 406-438-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HELENA MT
2023-02-22 406-512-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BOULDER MT
2023-02-22 406-942-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 GLASGOW MT
2023-02-17 406-507-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 WHITEFISH MT
2023-02-15 406-308-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 CASCADE MT
2023-02-15 406-888-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 W GLACIER MT
2023-02-15 406-909-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 COLUMBIFLS MT
2023-02-06 406-574-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 SILVERTIP MT
2023-02-06 406-659-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 NO PARKMAN MT
2023-02-06 406-982-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 YELLOW BAY MT
2023-02-03 406-226-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 EGLACIERPK MT
2023-02-03 406-387-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HUNGRYHORS MT
2023-02-03 406-844-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 LAKESIDE MT
2023-02-03 406-849-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ELMO MT
2023-02-03 406-854-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MARION MT
2023-02-03 406-881-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 OLNEY MT
2023-02-03 406-887-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FINLEY PT MT
2023-02-03 406-957-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 TERRY MT
2023-02-03 406-980-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 TOWNSEND MT
2023-01-25 406-328-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ABSAROKEE MT
2022-12-20 406-262-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HAVRE MT
2022-10-11 406-601-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BILLINGS MT
2022-08-31 406-613-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BOZEMAN MT
2022-08-03 406-218-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2022-03-01 406-550-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2021-09-10 406-609-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 KALISPELL MT
2021-09-08 406-558-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HELENA MT
2021-06-29 406-901-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BILLINGS MT
2021-06-03 406-519-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2021-04-07 406-419-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 VICTOR MT
2021-02-16 406-504-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FAIRFIELD MT

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.