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 475
TELEPORT COMMUNICATIONS AMERICA, LLC - CT 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
2026-06-09 475-678-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 DANBURY CT
2022-06-14 475-332-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2022-03-25 475-356-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2021-05-20 475-348-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 DANBURY CT
2020-12-07 475-271-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 MILFORD CT
2020-12-07 475-274-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 GUILFORD CT
2019-06-24 475-262-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 HUNTINGTON CT
2019-05-09 475-476-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2019-02-25 475-236-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2019-02-25 475-330-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 FAIRFIELD CT
2018-11-27 475-685-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 STAMFORD CT
2018-11-07 475-666-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 WESTPORT CT
2018-10-17 475-236-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2016-08-01 475-210-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2016-03-22 475-230-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2015-11-23 475-292-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 STAMFORD CT
2014-12-29 475-619-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 STAMFORD CT
2014-04-16 475-329-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 DANBURY CT

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.