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 413
TC SYSTEMS, INC. 31
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
2023-11-02 413-558-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 WARREN MA
2023-04-21 413-466-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 HOLYOKE MA
2023-04-14 413-966-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 NORTHAMPTN MA
2023-03-22 413-666-9XXX 9000–9999Assigned TC SYSTEMS, INC. 7135 GRANVILLE MA
2023-01-27 413-352-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 SPRINGFLD MA
2023-01-27 413-352-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 SPRINGFLD MA
2023-01-27 413-352-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 SPRINGFLD MA
2023-01-27 413-352-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 SPRINGFLD MA
2023-01-24 413-942-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 COLRAIN MA
2022-12-12 413-462-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SANDISFLD MA
2022-12-12 413-476-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 SHEFFIELD MA
2022-10-04 413-432-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SPRINGFLD MA
2019-09-12 413-299-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 HATFIELD MA
2019-03-27 413-305-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SOUTHWICK MA
2019-03-27 413-758-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 WARE MA
2018-02-08 413-937-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 LEE MA
2017-12-28 413-500-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 MONROE BDG MA
2017-12-12 413-846-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 SPRINGFLD MA
2015-09-04 413-267-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 MONSON MA
2012-10-18 413-370-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 PALMER MA
2012-06-01 413-345-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 AMHERST MA
2012-06-01 413-366-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 WILBRAHAM MA
2012-06-01 413-486-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 ELONGMEDOW MA
2012-06-01 413-676-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 TURNERSFLS MA
2012-06-01 413-754-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 LONGMEADOW MA
2012-06-01 413-779-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 EASTHAMPTN MA
2010-05-03 413-728-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 LENOX MA
2009-05-18 413-350-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SO DEERFLD MA
2005-06-28 413-729-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 WESTFIELD MA
2002-11-06 413-315-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 HOLYOKE MA
2002-02-06 413-242-0XXX 0000–0999Assigned TC SYSTEMS, INC. 7135 PITTSFIELD 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.