NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

10 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, last 30 days — NPA 406
T-MOBILE USA, INC. 7
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 2
NEW CINGULAR WIRELESS PCS, LLC 1
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
2014-05-01 406-314-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KALISPELL MT
2014-04-30 406-226-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EGLACIERPK MT
2014-04-30 406-229-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CUT BANK MT
2014-04-30 406-300-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KALISPELL MT
2014-04-30 406-313-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOULDER MT
2014-04-30 406-387-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HUNGRYHORS MT
2014-04-30 406-415-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DEER LODGE MT
2014-04-30 406-505-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CONRAD MT
2014-04-30 406-508-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FRENCHTOWN MT
2014-04-30 406-521-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TOWNSEND MT
2014-04-30 406-625-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J STEVENSVL MT
2014-04-30 406-642-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J VICTOR MT
2014-04-30 406-708-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LEWISTOWN MT
2014-04-30 406-732-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ST MARY MT
2014-04-30 406-802-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAMILTON MT
2014-04-30 406-808-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAVRE MT
2014-04-30 406-849-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELMO MT
2014-04-30 406-857-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOMERS MT
2014-04-30 406-872-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J POLSON MT
2014-04-30 406-886-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SWAN LAKE MT
2014-04-30 406-887-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FINLEY PT MT
2014-04-30 406-888-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J W GLACIER MT
2014-04-30 406-897-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLUMBIFLS MT
2014-04-30 406-966-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SHELBY MT
2014-04-29 406-201-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E FORSYTH MT
2014-04-29 406-691-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ANACONDA MT
2014-04-29 406-837-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BIGFORK MT
2014-04-29 406-848-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GARDINER MT
2014-04-23 406-361-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HAMILTON MT
2014-04-18 406-315-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K GREATFALLS MT
2014-04-18 406-371-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2014-04-18 406-502-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HELENA MT
2014-04-15 406-361-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
2014-03-19 406-577-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2014-03-19 406-577-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2014-03-19 406-792-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BUTTE MT
2014-03-19 406-792-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BUTTE MT
2014-03-19 406-927-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-03-19 406-927-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-03-19 406-927-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-03-06 406-616-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E THREEFORKS MT
2014-03-06 406-640-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WYELLOWSTN MT
2014-03-05 406-284-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MANHATTAN MT
2014-02-26 406-534-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2014-02-12 406-688-8XXX 8000–8999Assigned SAGEBRUSH CELLULAR, INC. 443B SCOBEY MT
2014-02-12 406-688-9XXX 9000–9999Assigned SAGEBRUSH CELLULAR, INC. 443B SCOBEY MT
2014-02-11 406-812-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LAUREL MT
2014-02-10 406-927-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-01-21 406-540-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2014-01-21 406-540-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT

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.