NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2018-05-30 406-477-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 LAME DEER MT
2018-05-24 406-909-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBIFLS MT
2018-05-08 406-290-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COLUMBUS MT
2018-05-08 406-306-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MANHATTAN MT
2018-05-01 406-561-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2018-05-01 406-561-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2018-04-30 406-300-8XXX 8000–8999Assigned METROPCS, INC. 5562 KALISPELL MT
2018-03-28 406-384-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-03-28 406-413-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-03-28 406-413-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-03-28 406-413-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-03-27 406-382-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUPERIOR MT
2018-03-22 406-333-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G LIVINGSTON MT
2018-03-13 406-561-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2018-03-09 406-213-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COLSTRIP MT
2018-03-05 406-351-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FORSYTH MT
2018-02-28 406-946-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2018-02-15 406-345-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H GLENDIVE MT
2018-02-06 406-630-8XXX 8000–8999Assigned AIRUS, INC. - MT 588H SIDNEY MT
2018-02-06 406-635-8XXX 8000–8999Assigned AIRUS, INC. - MT 588H TERRY MT
2018-02-06 406-851-9XXX 9000–9999Assigned AIRUS, INC. - MT 588H MILES CITY MT
2018-02-02 406-577-0XXX 0000–0999Assigned AIRUS, INC. - MT 588H BOZEMAN MT
2018-01-31 406-998-0XXX 0000–0999Assigned AIRUS, INC. - MT 588H BILLINGS MT
2018-01-03 406-304-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2018-01-02 406-344-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAVRE MT
2017-12-27 406-344-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAVRE MT
2017-12-27 406-361-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
2017-12-18 406-242-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 THOMPSNFLS MT
2017-11-30 406-589-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2017-11-06 406-601-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2017-11-06 406-601-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2017-11-06 406-601-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2017-10-23 406-300-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2017-10-23 406-306-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2017-10-23 406-612-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F SWAN LAKE MT
2017-10-18 406-215-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2017-10-18 406-415-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2017-10-18 406-451-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2017-10-13 406-315-9XXX 9000–9999Assigned SAGEBRUSH CELLULAR, INC. 443B GREATFALLS MT
2017-10-12 406-780-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBUS MT
2017-09-29 406-900-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ENNIS MT
2017-09-26 406-476-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 DUTTON MT
2017-09-18 406-970-1XXX 1000–1999Assigned NUSO, LLC 551G BILLINGS MT
2017-09-15 406-894-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2017-09-05 406-400-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F HAVRE MT
2017-08-21 406-577-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2017-08-11 406-371-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BILLINGS MT
2017-08-10 406-622-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K FORTBENTON MT
2017-08-09 406-551-8XXX 8000–8999Assigned TRI TEL, INC. - MT 935G BOZEMAN MT
2017-08-07 406-204-8XXX 8000–8999Assigned METROPCS, INC. 5562 HELENA MT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.