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 410
TELEPORT COMMUNICATIONS AMERICA, LLC - MD 18
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
2020-09-14 410-631-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
2016-04-06 410-582-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 GLENBURNIE MD
2016-04-06 410-582-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 GLENBURNIE MD
2014-09-24 410-275-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CECILTON MD
2014-09-24 410-482-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 GREENSBORO MD
2014-09-24 410-648-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 GALENA MD
2014-09-22 410-600-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BERLIN MD
2012-08-15 410-862-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 WATERLO236 MD
2012-06-21 410-831-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 SALISBURY MD
2012-06-20 410-745-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 STMICHAELS MD
2009-06-11 410-390-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 OCEAN CITY MD
2007-09-21 410-565-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 ARBUTUS MD
2007-07-10 410-231-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 SOLOMONS MD
2006-07-05 410-741-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 WEST RIVER MD
2006-07-05 410-849-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 SHERWD FOR MD
2002-11-06 410-372-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 TOWSON MD
2002-05-23 410-690-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 EASTON MD
2002-04-30 410-401-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BRYNPKLNCM MD

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.