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
2014-12-09 406-318-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2014-12-09 406-318-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2014-11-13 406-350-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LEWISTOWN MT
2014-10-22 406-417-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G HELENA MT
2014-10-14 406-229-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CUT BANK MT
2014-10-14 406-334-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LIBBY MT
2014-10-14 406-850-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2014-10-07 406-478-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2014-10-07 406-499-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2014-10-07 406-606-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-10-07 406-606-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-09-30 406-203-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2014-09-30 406-551-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BOZEMAN MT
2014-09-30 406-558-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HELENA MT
2014-09-23 406-299-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G BUTTE MT
2014-09-18 406-200-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2014-09-18 406-200-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2014-09-18 406-200-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2014-09-18 406-894-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2014-09-11 406-303-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2014-09-11 406-303-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2014-09-05 406-200-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-09-05 406-404-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2014-08-20 406-845-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CUT BANK MT
2014-08-07 406-200-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-08-07 406-200-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-08-07 406-200-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-08-07 406-203-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2014-08-07 406-417-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2014-08-06 406-638-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HARDIN MT
2014-08-06 406-679-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HARDIN MT
2014-07-23 406-404-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2014-07-23 406-404-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2014-07-16 406-200-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-07-16 406-851-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MILES CITY MT
2014-07-14 406-577-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G BOZEMAN MT
2014-06-17 406-200-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2014-06-17 406-299-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BUTTE MT
2014-06-17 406-300-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2014-06-17 406-660-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DILLON MT
2014-06-17 406-692-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K YELLOW BAY MT
2014-06-13 406-203-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2014-06-13 406-603-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2014-05-15 406-219-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BOZEMAN MT
2014-05-15 406-540-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MISSOULA MT
2014-05-13 406-300-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G KALISPELL MT
2014-05-06 406-925-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DILLON MT
2014-05-05 406-302-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WOLF CREEK MT
2014-05-05 406-863-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WHITEFISH MT
2014-05-05 406-982-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YELLOW BAY 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.