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 513
LEVEL 3 TELECOM OF OHIO, LLC - OH 28
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
2015-10-07 513-832-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2015-09-08 513-954-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2015-05-06 513-857-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 HAMILTON OH
2014-03-10 513-592-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2012-04-05 513-714-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 HAMILTON OH
2011-12-07 513-507-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2008-05-01 513-206-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2007-10-17 513-824-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2007-10-17 513-824-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-12-20 513-746-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-12-20 513-746-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-12-20 513-746-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-08-25 513-766-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-08-25 513-766-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-08-25 513-878-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-08-23 513-924-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-08-23 513-924-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-08-17 513-273-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 OXFORD OH
2006-08-17 513-827-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-07-26 513-536-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 WILLIAMSBG OH
2006-06-07 513-924-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2006-02-10 513-273-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 OXFORD OH
2005-12-06 513-386-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2005-12-06 513-386-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2005-10-11 513-360-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 MONROE OH
2005-08-30 513-569-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CINCINNATI OH
2005-07-07 513-645-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 HAMILTON OH
2004-02-20 513-323-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 SHANDON OH

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.