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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-07-07 406-740-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLSTRIP MT
2016-07-07 406-742-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FAIRVIEW MT
2016-07-07 406-743-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LAUREL MT
2016-07-07 406-780-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLUMBUS MT
2016-07-07 406-800-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRIDGER MT
2016-07-07 406-813-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELGRADE MT
2016-07-07 406-838-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COOKE CITY MT
2016-07-07 406-946-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LIVINGSTON MT
2016-07-07 406-987-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GLENDIVE MT
2016-06-29 406-300-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2016-06-29 406-384-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2016-06-16 406-325-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2016-06-07 406-970-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2016-05-31 406-382-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 SUPERIOR MT
2016-05-31 406-826-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 PLAINS MT
2016-05-20 406-559-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ANACONDA MT
2016-05-09 406-607-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2016-05-09 406-770-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GREATFALLS MT
2016-05-09 406-830-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2016-05-09 406-830-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2016-04-22 406-886-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 SWAN LAKE MT
2016-04-06 406-300-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2016-03-25 406-304-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2016-03-25 406-887-1XXX 1000–1999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F FINLEY PT MT
2016-03-23 406-830-2XXX 2000–2999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F MISSOULA MT
2016-03-23 406-858-1XXX 1000–1999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F KALISPELL MT
2016-03-22 406-218-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2016-03-11 406-743-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G LAUREL MT
2016-02-19 406-808-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G HAVRE MT
2016-02-16 406-571-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F FINLEY PT MT
2016-02-16 406-571-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F FINLEY PT MT
2016-01-27 406-389-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HELENA MT
2016-01-27 406-946-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LIVINGSTON MT
2016-01-26 406-946-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2016-01-11 406-604-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GREATFALLS MT
2016-01-08 406-998-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2015-12-30 406-491-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BUTTE MT
2015-12-24 406-926-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2015-11-30 406-318-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2015-11-30 406-325-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2015-11-30 406-414-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2015-11-30 406-897-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F COLUMBIFLS MT
2015-11-05 406-230-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GLASGOW MT
2015-11-05 406-998-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2015-10-15 406-897-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K COLUMBIFLS MT
2015-10-01 406-314-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2015-09-25 406-884-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 POLSON MT
2015-08-31 406-262-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAVRE MT
2015-08-26 406-998-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H BILLINGS MT
2015-08-12 406-802-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HAMILTON 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.