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
2018-10-26 406-353-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HARLEM MT
2018-10-26 406-557-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 JORDAN MT
2018-10-26 406-561-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2018-10-24 406-359-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GLENDIVE MT
2018-10-24 406-428-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GRASSRANGE MT
2018-10-24 406-464-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ROY MT
2018-10-24 406-485-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CIRCLE MT
2018-10-24 406-525-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SO WOLF PT MT
2018-10-24 406-635-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 TERRY MT
2018-10-24 406-772-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 PLEVNA MT
2018-10-24 406-773-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RICHEY MT
2018-10-24 406-774-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LAMBERT MT
2018-10-24 406-775-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 EKALAKA MT
2018-10-24 406-778-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BAKER MT
2018-10-24 406-931-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BIG TIMBER MT
2018-10-24 406-935-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BROADUS MT
2018-10-24 406-938-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ALZADA MT
2018-10-24 406-981-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOMILES CY MT
2018-10-24 406-983-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ASHLAND MT
2018-10-18 406-607-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2018-09-27 406-606-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-09-27 406-606-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-09-27 406-661-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2018-09-10 406-384-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2018-09-10 406-402-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2018-08-22 406-314-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2018-08-02 406-309-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 KALISPELL MT
2018-07-23 406-384-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2018-07-13 406-306-8XXX 8000–8999Assigned TELNYX LLC 073H MANHATTAN MT
2018-07-13 406-356-1XXX 1000–1999Assigned TELNYX LLC 073H FORSYTH MT
2018-07-13 406-359-0XXX 0000–0999Assigned TELNYX LLC 073H GLENDIVE MT
2018-07-13 406-574-0XXX 0000–0999Assigned TELNYX LLC 073H SILVERTIP MT
2018-07-13 406-616-8XXX 8000–8999Assigned TELNYX LLC 073H THREEFORKS MT
2018-07-13 406-635-0XXX 0000–0999Assigned TELNYX LLC 073H TERRY MT
2018-07-13 406-640-9XXX 9000–9999Assigned TELNYX LLC 073H WYELLOWSTN MT
2018-07-13 406-643-1XXX 1000–1999Assigned TELNYX LLC 073H NO PARKMAN MT
2018-07-13 406-720-9XXX 9000–9999Assigned TELNYX LLC 073H COLSTRIP MT
2018-07-13 406-729-0XXX 0000–0999Assigned TELNYX LLC 073H WILSALL MT
2018-07-13 406-742-0XXX 0000–0999Assigned TELNYX LLC 073H FAIRVIEW MT
2018-07-13 406-795-0XXX 0000–0999Assigned TELNYX LLC 073H WIBAUX MT
2018-07-13 406-800-9XXX 9000–9999Assigned TELNYX LLC 073H BRIDGER MT
2018-07-13 406-905-8XXX 8000–8999Assigned TELNYX LLC 073H JOLIET MT
2018-07-13 406-936-1XXX 1000–1999Assigned TELNYX LLC 073H CLYDE PARK MT
2018-07-11 406-561-2XXX 2000–2999Assigned METROPCS, INC. 5562 BILLINGS MT
2018-07-11 406-589-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOZEMAN MT
2018-06-27 406-760-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D GREATFALLS MT
2018-06-22 406-589-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2018-06-07 406-717-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D BILLINGS MT
2018-05-31 406-402-3XXX 3000–3999Assigned METROPCS, INC. 5562 GREATFALLS MT
2018-05-31 406-983-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ASHLAND 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.