NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 203-290

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 203-290 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
OMNIPOINT COMMUNICATIONS, INC. - CT 3
BANDWIDTH.COM CLEC, LLC - CT 2
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 1
ONVOY, LLC - CT 1
MCIMETRO ACCESS TRANSMISSION SERVICES 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
2014-03-19 203-290-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C BRIDGEPORT CT
2014-03-19 203-290-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2014-03-19 203-290-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2014-03-14 203-290-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 BRIDGEPORT CT
2014-04-02 203-290-4XXX 4000–4999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2014-04-04 203-290-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
2014-06-27 203-290-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 BRIDGEPORT CT
2014-09-05 203-290-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2014-09-05 203-290-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2013-11-14 203-290-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT 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.