NumberResearch Membership · Data 09/25/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/25/2026

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 337
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 26
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1
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
2024-02-26 337-634-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LK CHARLES LA
2022-01-26 337-487-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LEESVILLE LA
2020-10-19 337-549-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LK CHARLES LA
2019-06-17 337-265-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LAFAYETTE LA
2017-07-10 337-573-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 YOUNGSVL LA
2017-05-05 337-520-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 CARENCRO LA
2016-06-20 337-427-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 RAYNE LA
2014-07-28 337-417-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LAFAYETTE LA
2012-10-26 337-935-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 DUSON LA
2012-09-11 337-357-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 WEEKS IS LA
2011-11-23 337-305-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 EUNICE LA
2011-11-04 337-990-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LK CHARLES LA
2011-01-11 337-441-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 STMARTINVL LA
2011-01-11 337-717-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 CROWLEY LA
2010-12-27 337-347-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LAFAYETTE LA
2010-11-01 337-324-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 VINTON LA
2010-07-08 337-348-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 DE RIDDER LA
2010-06-14 337-714-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 BROUSSARD LA
2010-05-24 337-476-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 SULPHUR LA
2010-01-14 337-388-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 JENNINGS LA
2010-01-14 337-413-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 FRANKLIN LA
2010-01-14 337-422-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 ABBEVILLE LA
2010-01-14 337-548-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAKEARTHUR LA
2007-02-05 337-381-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 OPELOUSAS LA
2006-11-15 337-606-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 NEW IBERIA LA
2006-11-15 337-656-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LK CHARLES LA
2006-03-28 337-718-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LEESVILLE LA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.