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 228
LEVEL 3 COMMUNICATIONS, LLC - MS 55
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
2020-09-29 228-344-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BAYSTLOUIS MS
2020-09-29 228-901-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 HURLEY MS
2014-04-11 228-641-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 TANNERWLMS MS
2013-10-02 228-220-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BAYSTLOUIS MS
2012-08-03 228-284-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2012-06-29 228-271-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2012-02-15 228-273-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2012-01-26 228-533-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PEARLINGTN MS
2011-12-13 228-205-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASCAGOULA MS
2011-12-13 228-826-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 VANCLEAVE MS
2011-10-18 228-220-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BAYSTLOUIS MS
2011-05-27 228-285-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 MOSS POINT MS
2011-05-12 228-202-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASCAGOULA MS
2011-05-12 228-254-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASSCHRSTN MS
2011-05-12 228-284-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2011-05-12 228-284-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2011-03-15 228-215-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 OCEAN SPG MS
2010-11-03 228-284-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2010-09-15 228-215-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 OCEAN SPG MS
2010-09-15 228-265-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2010-04-23 228-265-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2009-12-28 228-206-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2009-07-29 228-265-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2008-11-25 228-215-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 OCEAN SPG MS
2008-08-04 228-591-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 VANCLEAVE MS
2008-07-29 228-901-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 HURLEY MS
2008-05-07 228-285-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 MOSS POINT MS
2008-02-01 228-205-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASCAGOULA MS
2008-01-21 228-205-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASCAGOULA MS
2008-01-15 228-202-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASCAGOULA MS
2007-11-09 228-215-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 OCEAN SPG MS
2007-11-09 228-285-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 MOSS POINT MS
2006-08-23 228-222-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASSCHRSTN MS
2006-08-23 228-222-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASSCHRSTN MS
2006-08-23 228-222-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PASSCHRSTN MS
2006-07-24 228-447-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 OCEAN SPG MS
2006-04-18 228-376-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2006-04-18 228-376-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2005-03-31 228-273-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS
2005-02-01 228-284-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GULFPORT MS
2005-01-24 228-220-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BAYSTLOUIS MS
2004-12-06 228-273-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MS 5178 BILOXI MS

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.