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
2011-01-07 406-941-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 W GLENDIVE MT
2010-12-17 406-415-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 DEER LODGE MT
2010-12-17 406-559-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ANACONDA MT
2010-12-17 406-625-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 STEVENSVL MT
2010-12-17 406-961-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HAMILTON MT
2010-12-13 406-640-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WYELLOWSTN MT
2010-12-13 406-686-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E CLYDE PARK MT
2010-12-13 406-763-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GALATNGTWY MT
2010-12-09 406-399-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOUTHHAVRE MT
2010-12-09 406-478-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2010-12-08 406-794-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2010-12-07 406-210-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2010-11-11 406-845-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CUT BANK MT
2010-11-04 406-730-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F WHITEFISH MT
2010-10-21 406-305-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WHSLPHRSPG MT
2010-10-21 406-514-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULBERTSON MT
2010-10-21 406-956-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BAKER MT
2010-10-14 406-407-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2010-10-14 406-505-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CONRAD MT
2010-10-07 406-203-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2010-10-07 406-221-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BUTTE MT
2010-10-07 406-266-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TOWNSEND MT
2010-10-07 406-290-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 COLUMBUS MT
2010-10-07 406-369-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAMILTON MT
2010-10-07 406-478-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIDNEY MT
2010-10-07 406-530-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LAUREL MT
2010-10-07 406-559-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ANACONDA MT
2010-10-07 406-564-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GREATFALLS MT
2010-10-07 406-577-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2010-10-07 406-852-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MILES CITY MT
2010-10-07 406-879-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAVRE MT
2010-10-07 406-941-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 W GLENDIVE MT
2010-09-22 406-219-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2010-09-22 406-272-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2010-09-10 406-438-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2010-09-10 406-548-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2010-09-09 406-647-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2010-09-09 406-647-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2010-08-25 406-552-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2010-08-25 406-552-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2010-08-25 406-564-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2010-08-25 406-564-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2010-08-25 406-830-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2010-08-19 406-407-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2010-08-12 406-927-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2010-08-06 406-399-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOUTHHAVRE MT
2010-08-06 406-548-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2010-08-05 406-890-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2010-08-04 406-278-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F CONRAD MT
2010-07-26 406-647-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS 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.