NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 COMMUNICATIONS, LLC - OH 165
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
2025-07-03 513-223-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2025-07-03 513-301-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2025-07-03 513-426-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2025-07-03 513-426-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2023-02-08 513-796-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MORNINGSUN OH
2021-04-29 513-838-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2021-02-23 513-837-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2021-01-20 513-743-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2020-10-08 513-991-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2020-09-16 513-991-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2020-07-23 513-993-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2020-04-21 513-640-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LTL MIAMI OH
2020-04-21 513-810-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2019-09-03 513-514-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2019-07-09 513-599-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2019-07-09 513-599-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2018-03-26 513-472-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MORROW OH
2017-02-06 513-270-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FELICITY OH
2016-09-27 513-883-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HAMILTON OH
2016-08-29 513-973-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HAMILTON OH
2016-03-31 513-996-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2016-03-31 513-996-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2016-03-31 513-996-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2015-07-30 513-914-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2015-07-30 513-914-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2015-06-17 513-906-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2015-06-17 513-906-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2015-05-18 513-906-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2015-05-18 513-906-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-10-07 513-978-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-10-01 513-718-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLERMONT OH
2014-10-01 513-904-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-10-01 513-904-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-10-01 513-904-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-08-07 513-815-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-08-07 513-815-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-08-07 513-817-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-06-16 513-447-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SHANDON OH
2014-06-13 513-657-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-06-13 513-657-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-05-23 513-657-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-05-23 513-808-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-04-08 513-592-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-04-08 513-592-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-03-06 513-802-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-03-06 513-813-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2014-02-19 513-855-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WAYNESVL OH
2014-01-15 513-342-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BETHANY OH
2013-12-20 513-813-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2013-12-20 513-813-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.