NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 203-364

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 203-364 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 203 blocks

Most active assignees, all time — NPA 203
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 5
OMNIPOINT COMMUNICATIONS, INC. - CT 2
PAETEC ITEL, LLC 1
LEVEL 3 COMMUNICATIONS, LLC - CT 1
BANDWIDTH.COM CLEC, LLC - CT 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
— 203-364-0XXX 0000–0999Reserved SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEWTOWN CT
— 203-364-1XXX 1000–1999Reserved SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEWTOWN CT
— 203-364-2XXX 2000–2999Reserved SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEWTOWN CT
— 203-364-3XXX 3000–3999Reserved SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEWTOWN CT
2008-10-30 203-364-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEWTOWN CT
2004-03-22 203-364-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEWTOWN CT
2002-11-25 203-364-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEWTOWN CT
2002-11-25 203-364-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEWTOWN CT
2001-07-18 203-364-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J NEWTOWN CT
— 203-364-9XXX 9000–9999Reserved SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEWTOWN CT

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.