NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 320-743

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

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

The ten 1,000-number thousand-blocks inside prefix 320-743 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 320 blocks

Most active assignees, all time — NPA 320
CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 5
ONVOY, LLC - MN 2
NEW CINGULAR WIRELESS PCS, LLC - IL 1
MIDCONTINENT COMMUNICATIONS - MN 1
BANDWIDTH.COM CLEC, LLC - MN 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
2011-09-20 320-743-0XXX 0000–0999Assigned MIDCONTINENT COMMUNICATIONS - MN 429A CLEAR LAKE MN
2014-12-19 320-743-1XXX 1000–1999Assigned ONVOY, LLC - MN 184D CLEAR LAKE MN
— 320-743-2XXX 2000–2999Reserved CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 1123 CLEAR LAKE MN
— 320-743-3XXX 3000–3999Reserved CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 1123 CLEAR LAKE MN
— 320-743-4XXX 4000–4999Reserved CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 1123 CLEAR LAKE MN
— 320-743-5XXX 5000–5999Reserved CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 1123 CLEAR LAKE MN
2016-06-29 320-743-6XXX 6000–6999Assigned ONVOY, LLC - MN 184D CLEAR LAKE MN
2016-11-30 320-743-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEAR LAKE MN
2008-11-04 320-743-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MN 980E CLEAR LAKE MN
— 320-743-9XXX 9000–9999Reserved CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 1123 CLEAR LAKE MN

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.