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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2021-02-28 406-730-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F WHITEFISH MT
2021-02-28 406-742-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2021-02-25 406-417-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2021-02-17 406-607-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2021-02-16 406-504-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FAIRFIELD MT
2021-02-11 406-717-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-02-11 406-717-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-02-11 406-916-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 HELENA MT
2021-02-09 406-319-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F POLSON MT
2021-02-09 406-319-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F POLSON MT
2021-02-09 406-369-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2021-02-09 406-393-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F SOMERS MT
2021-02-09 406-393-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F SOMERS MT
2021-02-09 406-416-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2021-02-09 406-418-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F COOKE CITY MT
2021-02-09 406-418-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F COOKE CITY MT
2021-02-09 406-419-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F VICTOR MT
2021-02-09 406-419-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F VICTOR MT
2021-02-09 406-476-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F DUTTON MT
2021-02-09 406-476-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F DUTTON MT
2021-02-09 406-479-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-02-09 406-479-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-02-09 406-479-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-02-09 406-508-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2021-02-09 406-508-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2021-02-09 406-521-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F TOWNSEND MT
2021-02-09 406-635-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F TERRY MT
2021-02-09 406-645-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2021-02-09 406-645-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2021-02-09 406-693-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F WARM SPG MT
2021-02-09 406-709-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F LAKESIDE MT
2021-02-09 406-729-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F WILSALL MT
2021-02-09 406-729-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F WILSALL MT
2021-02-09 406-777-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F STEVENSVL MT
2021-02-09 406-777-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F STEVENSVL MT
2021-02-09 406-795-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2021-02-09 406-796-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2021-02-09 406-797-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2021-02-09 406-797-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2021-02-09 406-800-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F BRIDGER MT
2021-02-09 406-802-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2021-02-09 406-804-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F GARDINER MT
2021-02-09 406-804-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F GARDINER MT
2021-02-09 406-808-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F HAVRE MT
2021-02-09 406-808-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F HAVRE MT
2021-02-09 406-815-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2021-02-09 406-815-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2021-02-09 406-844-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F LAKESIDE MT
2021-02-09 406-851-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2021-02-09 406-851-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F MILES CITY 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.