NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 720-606

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 720-606 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 720 blocks

Most active assignees, all time — NPA 720
LEVEL 3 COMMUNICATIONS, LLC - CO 4
NEW CINGULAR WIRELESS PCS, LLC 2
PEERLESS NETWORK OF COLORADO, LLC - CO 1
PAETEC ITEL, LLC 1
ONVOY, LLC - CO 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
2013-04-02 720-606-0XXX 0000–0999Assigned PEERLESS NETWORK OF COLORADO, LLC - CO 278F FORTLUPTON CO
2012-09-19 720-606-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2011-09-09 720-606-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2011-11-11 720-606-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2011-11-23 720-606-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2012-02-08 720-606-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2013-01-02 720-606-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2012-04-13 720-606-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D FORTLUPTON CO
2012-05-08 720-606-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J FORTLUPTON CO
2011-08-15 720-606-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO

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.