NumberResearch Membership · Data 09/21/2026

Thousands-blocks in 406-345

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 406-345 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 406 blocks

Most active assignees, all time — NPA 406
MID-RIVERS TELEPHONE COOPERATIVE, INC. 5
ONVOY, LLC - MT 2
TERRA NOVA TELECOM INC. 1
BANDWIDTH.COM CLEC, LLC - MT 1
AIRUS, INC. - MT 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
2016-11-28 406-345-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
2018-02-15 406-345-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H GLENDIVE MT
— 406-345-2XXX 2000–2999Reserved MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 GLENDIVE MT
— 406-345-3XXX 3000–3999Reserved MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 GLENDIVE MT
2020-12-22 406-345-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J GLENDIVE MT
2021-11-05 406-345-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GLENDIVE MT
2019-09-30 406-345-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
— 406-345-7XXX 7000–7999Reserved MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 GLENDIVE MT
— 406-345-8XXX 8000–8999Reserved MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 GLENDIVE MT
— 406-345-9XXX 9000–9999Reserved MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 GLENDIVE 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.