NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 617-379

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 617-379 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 617 blocks

Most active assignees, all time — NPA 617
LEVEL 3 COMMUNICATIONS, LLC - MA 6
RCN TELECOM SERVICES, INC. - MA 2
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 1
TC SYSTEMS, INC. 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
2005-08-03 617-379-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
2007-05-14 617-379-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
2006-06-15 617-379-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
2008-01-17 617-379-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
2003-11-04 617-379-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 DORCHESTER MA
2005-03-08 617-379-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DORCHESTER MA
2008-02-05 617-379-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
2008-02-05 617-379-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
— 617-379-8XXX 8000–8999Reserved RCN TELECOM SERVICES, INC. - MA 7619 DORCHESTER MA
— 617-379-9XXX 9000–9999Reserved RCN TELECOM SERVICES, INC. - MA 7619 DORCHESTER MA

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.