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
2012-08-14 406-836-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2012-08-13 406-201-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E FORSYTH MT
2012-08-13 406-272-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2012-08-13 406-272-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2012-08-13 406-272-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2012-08-13 406-333-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LIVINGSTON MT
2012-08-13 406-813-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2012-08-09 406-301-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MALTA MT
2012-08-01 406-203-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2012-07-10 406-589-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2012-07-10 406-589-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2012-07-10 406-830-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2012-07-09 406-475-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2012-06-12 406-499-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2012-06-12 406-941-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 W GLENDIVE MT
2012-05-04 406-298-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COLUMBUS MT
2012-05-04 406-480-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2012-04-17 406-200-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G BILLINGS MT
2012-04-17 406-303-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G MISSOULA MT
2012-04-10 406-315-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K GREATFALLS MT
2012-04-10 406-407-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2012-04-10 406-451-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2012-04-05 406-479-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BUTTE MT
2012-04-04 406-404-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BOZEMAN MT
2012-04-04 406-502-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HELENA MT
2012-04-04 406-969-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2012-03-28 406-694-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-03-28 406-830-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2012-03-28 406-853-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MILES CITY MT
2012-03-27 406-475-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2012-03-20 406-840-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E SILVERTIP MT
2012-03-14 406-317-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MISSOULA MT
2012-03-14 406-702-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2012-03-07 406-314-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2012-03-05 406-301-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MALTA MT
2012-03-02 406-414-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2012-03-02 406-414-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2012-02-29 406-836-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2012-02-28 406-813-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BELGRADE MT
2012-02-21 406-301-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MALTA MT
2012-02-07 406-299-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BUTTE MT
2012-02-06 406-508-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FRENCHTOWN MT
2012-01-30 406-203-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2012-01-23 406-209-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2012-01-11 406-637-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E TERRY MT
2012-01-10 406-969-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2012-01-10 406-969-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2012-01-06 406-812-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LAUREL MT
2012-01-06 406-845-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CUT BANK MT
2011-12-19 406-795-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WIBAUX 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.