NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 617-668

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 617-668 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
TC SYSTEMS, INC. 6
TERRA NOVA TELECOM INC. 1
ONVOY, LLC - MA 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 617-668-0XXX 0000–0999Available WATERTOWN MA
2020-05-26 617-668-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D WATERTOWN MA
2020-01-14 617-668-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2010-05-04 617-668-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2015-08-14 617-668-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2016-01-19 617-668-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
— 617-668-6XXX 6000–6999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WATERTOWN MA
2019-10-23 617-668-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2019-10-23 617-668-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2022-04-07 617-668-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J WATERTOWN 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.