NumberResearch Membership · Data 09/26/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026

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 317
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 56
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
2017-07-20 317-419-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2015-06-24 317-567-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 FISHERS IN
2015-05-06 317-982-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2015-03-19 317-798-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
2015-03-18 317-981-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-12-31 317-864-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-09-15 317-675-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-09-15 317-675-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-09-15 317-675-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-09-15 317-675-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-09-15 317-675-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2014-06-17 317-350-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 BROWNSBURG IN
2014-05-02 317-406-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 PLAINFIELD IN
2014-02-20 317-975-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
2013-08-02 317-534-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 GREENWOOD IN
2013-02-01 317-530-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 WHITELAND IN
2012-10-02 317-853-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
2012-05-10 317-378-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2012-03-21 317-620-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 NEWPALSTIN IN
2012-03-05 317-599-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2012-01-17 317-599-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2011-12-07 317-857-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 WESTNEWTON IN
2011-09-29 317-567-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 FISHERS IN
2011-07-18 317-810-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
2011-04-15 317-494-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 FRANKLIN IN
2011-03-17 317-810-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
2007-09-13 317-308-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2007-09-13 317-735-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2007-05-24 317-352-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2007-04-26 317-268-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 PLAINFIELD IN
2007-03-27 317-810-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
2006-12-11 317-238-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-12-11 317-238-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-10-17 317-352-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-10-17 317-352-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-10-17 317-491-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-03-15 317-308-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-03-15 317-664-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-03-15 317-664-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
2006-01-26 317-539-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CLAYTON IN
2006-01-26 317-769-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 WHITESTOWN IN
2005-11-30 317-855-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 OAKLANDON IN
2005-11-15 317-399-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 WESTFIELD IN
2005-11-15 317-892-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 PITTSBORO IN
2005-08-24 317-386-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 DANVILLE IN
2005-05-27 317-214-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 NOBLESVL IN
2005-05-27 317-215-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 GREENWOOD IN
2005-05-27 317-395-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 SHELBYVL IN
2005-05-27 317-468-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 GREENFIELD IN
2005-05-27 317-584-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 MOORESVL IN

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.