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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2022-04-05 406-749-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J COLSTRIP MT
2022-04-01 406-876-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2022-03-03 406-402-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2022-03-01 406-550-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2022-02-24 406-417-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HELENA MT
2022-02-23 406-333-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LIVINGSTON MT
2022-02-21 406-418-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COOKE CITY MT
2022-02-18 406-902-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SHERIDAN MT
2022-01-27 406-607-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2022-01-27 406-607-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2022-01-27 406-760-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2022-01-27 406-898-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2022-01-27 406-922-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2022-01-26 406-220-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LIVINGSTON MT
2022-01-24 406-815-9XXX 9000–9999Assigned AT&T - LOCAL 7421 RED LODGE MT
2022-01-13 406-418-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COOKE CITY MT
2022-01-13 406-640-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WYELLOWSTN MT
2022-01-13 406-763-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GALATNGTWY MT
2022-01-13 406-905-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E JOLIET MT
2022-01-13 406-936-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E CLYDE PARK MT
2022-01-07 406-802-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAMILTON MT
2022-01-04 406-717-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2022-01-04 406-717-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2022-01-04 406-901-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2022-01-04 406-901-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2022-01-04 406-901-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-12-13 406-416-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 FORSYTH MT
2021-12-07 406-233-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MILES CITY MT
2021-12-07 406-818-5XXX 5000–5999Assigned TERRA NOVA TELECOM INC. 145J RED LODGE MT
2021-12-07 406-922-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J BOZEMAN MT
2021-12-06 406-479-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BUTTE MT
2021-11-30 406-235-8XXX 8000–8999Assigned TELNYX LLC 073H WOLF CREEK MT
2021-11-18 406-863-8XXX 8000–8999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F WHITEFISH MT
2021-11-08 406-897-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBIFLS MT
2021-11-05 406-220-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LIVINGSTON MT
2021-11-05 406-345-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GLENDIVE MT
2021-11-05 406-630-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E SIDNEY MT
2021-11-05 406-901-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-11-05 406-901-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-11-05 406-901-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-11-05 406-901-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-10-27 406-919-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2021-10-27 406-919-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2021-10-26 406-283-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LIBBY MT
2021-10-26 406-802-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
2021-10-21 406-225-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BOULDER MT
2021-10-21 406-289-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H CONRAD MT
2021-10-21 406-316-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H BOULDER MT
2021-10-21 406-338-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H BROWNING MT
2021-10-21 406-505-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H CONRAD 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.