NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, all time — NPA 617
TC SYSTEMS, INC. 28
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
2023-11-28 617-597-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 NEWTON MA
2020-01-14 617-668-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 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
2016-01-19 617-668-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2015-08-14 617-668-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2012-10-17 617-987-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 BRIGHTON MA
2011-08-23 617-514-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 DORCHESTER MA
2010-05-04 617-668-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2010-04-07 617-514-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 DORCHESTER MA
2008-04-25 617-672-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2008-04-25 617-672-9XXX 9000–9999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2005-02-25 617-671-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2004-03-12 617-932-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 BELMONT MA
2003-11-04 617-379-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 DORCHESTER MA
2002-06-20 617-231-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2002-04-29 617-409-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 CHELSEA MA
2002-04-29 617-544-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 EVERETT MA
2002-04-25 617-580-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 CHARLESTN MA
2002-04-25 617-602-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 ROXBURY 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.