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 281
LEVEL 3 COMMUNICATIONS, LLC - TX 265
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
2020-06-11 281-505-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KATY TX
2019-09-03 281-654-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAMMEL TX
2019-09-03 281-654-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAMMEL TX
2019-07-25 281-375-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BROOKSHIRE TX
2019-04-11 281-503-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 PORTER HTS TX
2019-04-09 281-801-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRING TX
2019-04-09 281-801-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRING TX
2018-06-13 281-462-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CROSBY TX
2017-05-02 281-365-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2017-05-02 281-365-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2015-12-29 281-899-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2014-02-24 281-916-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KEMAH TX
2013-12-17 281-769-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KATY TX
2013-08-15 281-769-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KATY TX
2012-12-19 281-730-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAMMEL TX
2012-09-20 281-371-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KATY TX
2012-08-23 281-205-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 TOMBALL TX
2012-07-13 281-724-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LEAGUECITY TX
2012-06-21 281-769-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KATY TX
2012-03-14 281-369-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ROSHARON TX
2012-02-10 281-724-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LEAGUECITY TX
2012-02-10 281-916-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KEMAH TX
2012-01-26 281-628-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAYTOWN TX
2011-11-11 281-299-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALVIN TX
2011-11-11 281-719-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRING TX
2011-10-20 281-724-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LEAGUECITY TX
2011-09-22 281-730-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAMMEL TX
2011-08-04 281-519-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 MANVEL TX
2011-07-12 281-724-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LEAGUECITY TX
2011-05-31 281-429-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 PORTER HTS TX
2011-05-26 281-769-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KATY TX
2011-05-13 281-407-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2011-05-13 281-407-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
2011-04-04 281-978-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2011-03-26 281-549-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KEMAH TX
2011-03-15 281-941-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LA PORTE TX
2010-11-18 281-809-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2010-11-18 281-809-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2010-11-18 281-809-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2010-11-18 281-809-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2010-11-12 281-978-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
2010-10-27 281-231-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 WESTFIELD TX

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.