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 781
TC SYSTEMS, INC. 42
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
2021-05-26 781-678-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 HULL MA
2021-02-16 781-612-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2021-02-16 781-612-9XXX 9000–9999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2018-09-13 781-943-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 WELLESLEY MA
2017-05-04 781-350-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 MEDFORD MA
2016-02-04 781-680-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 NORWOOD MA
2013-08-13 781-538-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2013-08-13 781-538-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2012-10-18 781-728-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 LINCOLN MA
2012-10-17 781-253-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SHARON MA
2012-10-17 781-546-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SCITUATE MA
2012-10-17 781-566-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 MARSHFIELD MA
2012-10-17 781-936-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 KINGSTON MA
2011-01-05 781-429-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 NEEDHAM MA
2010-09-22 781-429-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 NEEDHAM MA
2010-03-04 781-225-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2010-03-04 781-225-9XXX 9000–9999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2005-03-24 781-918-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2005-03-24 781-918-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2005-03-24 781-918-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 LEXINGTON MA
2004-04-30 781-737-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2004-04-30 781-737-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2004-04-30 781-737-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2004-04-30 781-737-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 CANTON MA
2003-11-24 781-803-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 WEYMOUTH MA
2003-11-04 781-518-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 MEDFORD 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.