NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

1 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, last 30 days — NPA 585
TC SYSTEMS, INC. - NY 1
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
2026-09-14 585-791-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 HENRIETTA NY
2024-01-12 585-817-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 PAVILION NY
2023-02-24 585-661-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 OAKFIELD NY
2023-02-24 585-946-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 AKRON NY
2023-01-19 585-855-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 BOLIVAR NY
2023-01-17 585-517-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 DALTON NY
2022-06-29 585-895-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2021-10-18 585-825-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 WEBSTER NY
2020-08-25 585-515-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 HILTON NY
2019-05-15 585-617-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 SPENCERPT NY
2019-05-15 585-639-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 BROCKPORT NY
2018-11-21 585-867-8XXX 8000–8999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2017-11-20 585-438-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 AVON NY
2013-08-30 585-215-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 WYOMING NY
2013-07-15 585-318-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 MEDINA NY
2009-08-06 585-203-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 EROCHESTER NY
2007-01-08 585-268-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 BELMONT NY
2005-06-27 585-672-0XXX 0000–0999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2005-06-27 585-672-8XXX 8000–8999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2004-05-07 585-269-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2004-05-07 585-269-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2004-05-07 585-269-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2003-06-05 585-228-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 WARSAW NY
2003-04-09 585-502-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 LE ROY NY
2000-11-02 585-494-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 BERGEN NY
2000-11-02 585-571-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 SCOTTSVL NY
2000-11-02 585-612-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 DANSVILLE NY
2000-10-13 585-805-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 EASTAURORA NY
2000-10-13 585-899-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 EROCHESTER NY
2000-10-13 585-937-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 ALDEN NY
2000-10-12 585-293-5XXX 5000–5999Assigned TC SYSTEMS, INC. - NY 7140 CHURCHVL NY
2000-10-12 585-582-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 HONEOYEFLS NY
2000-10-12 585-670-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 W WEBSTER NY
2000-10-12 585-964-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 HAMLIN NY
2000-10-11 585-545-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 WEBSTER NY
2000-09-07 585-869-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 VICTOR NY
2000-08-18 585-300-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 BATAVIA NY
2000-06-22 585-421-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 FAIRPORT NY
2000-06-22 585-486-8XXX 8000–8999Assigned TC SYSTEMS, INC. - NY 7140 HENRIETTA NY

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.