NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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 443
TELEPORT COMMUNICATIONS AMERICA, LLC - MD 22
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
2016-09-08 443-706-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CRISFIELD MD
2016-03-14 443-888-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 PRINCEANNE MD
2014-09-24 443-566-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHESAPKECY MD
2014-09-24 443-666-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHESTERTN MD
2014-05-07 443-448-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 DENTON MD
2013-09-06 443-301-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
2013-09-06 443-301-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
2012-06-20 443-249-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 STEVENSVL MD
2012-06-20 443-258-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 EASTON MD
2012-06-20 443-434-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FEDERALSBG MD
2012-06-20 443-515-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CAMBRIDGE MD
2012-03-06 443-437-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 POCOMOKE MD
2010-06-15 443-764-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 GLENBURNIE MD
2008-08-15 443-412-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHURCHVL MD
2008-08-15 443-412-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHURCHVL MD
2006-07-05 443-292-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CROFTON MD
2006-07-05 443-295-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 PRINCEFRCK MD
2006-07-05 443-964-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 NORTHBEACH MD
2004-10-21 443-784-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 ARGRGBSNIS MD
2004-06-29 443-662-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 SPARKSGLNC MD
2004-04-21 443-933-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 COCKEYSVL MD
2002-10-28 443-402-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 EDGEWOOD MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.