NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 603-838

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 603-838 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 603 blocks

Most active assignees, all time — NPA 603
CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 4
TWC IP ENABLED SERVICES, LLC 1
TERRA NOVA TELECOM INC. 1
PAETEC ITEL, LLC 1
NEW CINGULAR WIRELESS PCS, LLC - DC 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
2019-02-21 603-838-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LISBON NH
— 603-838-1XXX 1000–1999Available LISBON NH
— 603-838-2XXX 2000–2999Reserved CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LISBON NH
2004-08-09 603-838-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 LISBON NH
2021-04-28 603-838-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J LISBON NH
— 603-838-5XXX 5000–5999Reserved CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LISBON NH
— 603-838-6XXX 6000–6999Reserved CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LISBON NH
2004-06-25 603-838-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J LISBON NH
2012-07-30 603-838-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K LISBON NH
2014-06-11 603-838-9XXX 9000–9999Assigned CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LISBON NH

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.