NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 518
TC SYSTEMS, INC. - NY 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
2021-03-05 518-931-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 NASSAU NY
2020-10-21 518-724-8XXX 8000–8999Assigned TC SYSTEMS, INC. - NY 7140 COLONIE NY
2020-10-21 518-820-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CORINTH NY
2020-09-28 518-913-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 ASABLFORKS NY
2019-08-29 518-804-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 GLENSFALLS NY
2019-04-29 518-706-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 JOHNSTOWN NY
2018-12-07 518-592-9XXX 9000–9999Assigned TC SYSTEMS, INC. - NY 7140 MILLERTON NY
2018-02-14 518-509-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 ROUND LAKE NY
2017-03-02 518-912-0XXX 0000–0999Assigned TC SYSTEMS, INC. - NY 7140 ALBANY NY
2015-12-18 518-752-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 GLOVERSVL NY
2010-09-17 518-318-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CAIRO NY
2007-01-08 518-634-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 FREEHOLD NY
2007-01-08 518-981-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 WILLSBORO NY
2006-09-28 518-255-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 COBLESKILL NY
2003-06-30 518-576-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 KEENE NY
2003-06-30 518-623-8XXX 8000–8999Assigned TC SYSTEMS, INC. - NY 7140 WARRENSBG NY
2003-06-30 518-966-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 GREENVILLE NY
2003-06-17 518-304-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 SARANAC LK NY
2001-12-19 518-956-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 ALBANY NY
2000-10-19 518-278-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 JONESVILLE NY

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.