NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 508
TC SYSTEMS, INC. 20
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
2023-01-09 508-204-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 NEWBEDFORD MA
2012-10-18 508-321-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 MEDWAY MA
2012-10-18 508-401-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 WAYLAND MA
2012-10-18 508-469-7XXX 7000–7999Assigned TC SYSTEMS, INC. 7135 CHATHAM MA
2012-10-18 508-506-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 OXFORD MA
2012-10-18 508-576-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 NO ATTLEBO MA
2012-10-18 508-682-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 EASTON MA
2007-03-08 508-382-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2004-06-10 508-449-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2004-06-10 508-683-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2004-06-10 508-683-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2004-06-10 508-683-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 MARLBORO MA
2003-10-31 508-468-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 BROCKTON MA
2003-10-31 508-468-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 BROCKTON MA
2003-03-14 508-207-4XXX 4000–4999Assigned TC SYSTEMS, INC. 7135 NEWBEDFORD MA
2003-03-07 508-436-1XXX 1000–1999Assigned TC SYSTEMS, INC. 7135 BROCKTON MA
2003-03-07 508-436-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 BROCKTON MA
2003-03-07 508-436-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 BROCKTON MA
2002-09-18 508-809-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 NO ATTLEBO MA
2002-04-29 508-934-5XXX 5000–5999Assigned TC SYSTEMS, INC. 7135 DOVER MA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.