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 810
LEVEL 3 COMMUNICATIONS, LLC - MI 81
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
2022-01-27 810-712-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CROSWELL MI
2021-09-10 810-462-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YALE MI
2015-10-22 810-777-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2014-03-27 810-893-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2013-10-10 810-369-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GOODRICH MI
2013-10-08 810-350-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONTROSE MI
2013-10-08 810-634-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NEWLOTHROP MI
2013-10-08 810-797-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HADLEY MI
2013-07-12 810-212-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 METAMORA MI
2013-03-11 810-269-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SANDUSKY MI
2012-12-03 810-547-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CLIMTMORRS MI
2012-10-19 810-475-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BROWN CITY MI
2012-01-30 810-671-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ALGONAC MI
2011-12-22 810-893-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2011-08-03 810-294-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PORT HURON MI
2010-11-16 810-620-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2008-10-31 810-545-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 COLUMBIAVL MI
2008-02-19 810-201-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PT SANILAC MI
2008-01-31 810-370-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BYRON MI
2008-01-31 810-370-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BYRON MI
2008-01-17 810-266-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BYRON MI
2007-08-06 810-208-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FENTON MI
2007-08-06 810-208-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FENTON MI
2007-08-01 810-344-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GRANDBLANC MI
2007-02-19 810-412-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DAVISON MI
2007-01-23 810-395-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CAPAC MI
2006-11-29 810-360-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BRIGHTON MI
2006-11-29 810-360-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BRIGHTON MI
2006-11-17 810-366-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DECKERVL MI
2006-11-08 810-535-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MEMPHIS MI
2006-10-20 810-201-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PT SANILAC MI
2006-10-20 810-346-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BROWN CITY MI
2006-10-20 810-678-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 METAMORA MI
2006-09-06 810-671-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ALGONAC MI
2006-08-25 810-250-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2006-08-25 810-275-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2006-08-25 810-275-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2006-08-25 810-407-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
2006-08-24 810-375-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DRYDEN MI
2006-08-24 810-644-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SWARTZ CRK MI
2006-08-24 810-655-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 RANKIN MI
2006-08-22 810-673-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ALMONT MI
2006-08-21 810-545-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 COLUMBIAVL MI
2006-06-28 810-412-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DAVISON MI
2006-06-23 810-476-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 APPLEGATE MI
2006-04-27 810-270-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTH BRCH MI
2006-04-27 810-374-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 OTISVILLE MI
2006-04-27 810-487-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLUSHING MI
2006-04-27 810-547-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CLIMTMORRS MI
2006-04-27 810-683-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 IMLAY CITY MI

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.