NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 860-337

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 860-337 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 860 blocks

Most active assignees, all time — NPA 860
BANDWIDTH.COM CLEC, LLC - CT 6
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 1
PEERLESS NETWORK OF CONNECTICUT, LLC - CT 1
LEVEL 3 COMMUNICATIONS, LLC - CT 1
CHARTER IP ENABLED SERVICES, 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
2004-12-21 860-337-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K COLUMBIA CT
2008-10-30 860-337-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F COLUMBIA CT
2010-08-10 860-337-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F COLUMBIA CT
2020-07-14 860-337-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F COLUMBIA CT
2014-01-09 860-337-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F COLUMBIA CT
2011-04-13 860-337-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 COLUMBIA CT
2014-10-22 860-337-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F COLUMBIA CT
2007-01-02 860-337-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 COLUMBIA CT
2013-04-05 860-337-8XXX 8000–8999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F COLUMBIA CT
2020-12-11 860-337-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F COLUMBIA CT

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.