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 315
TC SYSTEMS, INC. - NY 27
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
2025-04-08 315-977-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 RICHFLDSPG NY
2021-02-17 315-260-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 MUNNSVILLE NY
2020-10-23 315-302-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 HERMON NY
2020-10-21 315-964-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 WILLIAMSTN NY
2019-04-29 315-629-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 EVANSMILLS NY
2019-04-29 315-815-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CAZENOVIA NY
2019-03-15 315-358-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 BOONVILLE NY
2018-04-11 315-544-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CARTHAGE NY
2018-03-20 315-692-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 MANLIUS NY
2017-06-19 315-973-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CLAYTON NY
2016-03-16 315-915-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CICERO NY
2015-05-12 315-750-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 HAMILTON NY
2013-01-23 315-444-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 ILION NY
2013-01-23 315-676-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CENTRAL SQ NY
2013-01-22 315-887-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 FULTON NY
2012-09-18 315-239-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 SENECA FLS NY
2012-08-24 315-801-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 UTICA NY
2011-04-19 315-902-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 CLYDE NY
2007-09-27 315-554-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 SKANEATLES NY
2003-12-05 315-554-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 SKANEATLES NY
2003-12-05 315-554-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 SKANEATLES NY
2003-06-17 315-276-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 MADRID NY
2003-06-17 315-333-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 ONTARIO NY
2003-06-17 315-497-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 MORAVIA NY
2003-06-17 315-871-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 LYONS NY
2003-06-17 315-875-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 CANASTOTA NY
2003-04-16 315-245-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 CAMDEN 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.