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 774
TC SYSTEMS, INC. 35
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
2026-05-07 774-236-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 NANTUCKET MA
2026-02-13 774-599-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2026-02-13 774-599-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2026-02-13 774-599-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2019-03-29 774-335-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 MILLIS MA
2019-03-22 774-387-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 BLACKSTONE MA
2018-10-10 774-551-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 GRAFTON MA
2018-09-21 774-378-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 WRENTHAM MA
2018-09-04 774-376-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 CARVER MA
2018-04-13 774-515-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 BOYLSTON MA
2017-11-21 774-601-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SOUTHBDG MA
2016-04-28 774-347-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 NOBROOKFLD MA
2016-03-08 774-775-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 WAREHAM MA
2016-02-17 774-813-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 WHITINSVL MA
2015-05-04 774-708-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 MILLBURY MA
2014-09-22 774-801-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 ORLEANS MA
2014-04-02 774-304-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 STURBRIDGE MA
2014-04-02 774-633-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 AUBURN MA
2013-10-09 774-702-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 VINEYRDHVN MA
2012-10-18 774-228-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 OSTERVILLE MA
2012-10-18 774-251-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 BARNSTABLE MA
2012-10-18 774-255-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 FALMOUTH MA
2012-10-18 774-282-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SOUTHGATE MA
2012-10-18 774-333-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 NANTUCKET MA
2012-10-18 774-352-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 DENNIS MA
2012-10-18 774-450-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 W BOYLSTON MA
2012-10-18 774-469-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 MEDFIELD MA
2012-10-18 774-481-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 UXBRIDGE MA
2012-10-18 774-642-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 HOLDEN MA
2011-05-12 774-213-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 MIDDLEBORO MA
2009-09-01 774-295-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 BELLINGHAM MA
2007-07-30 774-553-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 MARION MA
2005-12-01 774-278-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 HOPKINTON MA
2001-06-08 774-235-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 FRANKLIN MA
2001-05-09 774-324-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 MEDWAY 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.