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 667
LEVEL 3 COMMUNICATIONS, LLC - MD 83
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
2025-06-30 667-665-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HILLSBORO MD
2025-03-24 667-319-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHESTERTN MD
2022-11-02 667-418-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GREENSBORO MD
2022-10-25 667-279-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BISHOPVL MD
2022-10-25 667-293-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SHARPTOWN MD
2022-10-25 667-302-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CECILTON MD
2022-10-25 667-341-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DELMAR MD
2022-10-25 667-342-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PRESTON MD
2022-10-25 667-347-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FEDERALSBG MD
2022-10-25 667-687-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WARWICK MD
2022-10-25 667-767-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 STMICHAELS MD
2022-08-18 667-348-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 RIDGELY MD
2022-07-06 667-406-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2022-05-23 667-407-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2022-05-23 667-407-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2022-05-23 667-407-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2022-03-22 667-661-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SNOW HILL MD
2021-12-29 667-354-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-10-06 667-910-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-08-17 667-910-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-05-25 667-323-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 QUEENSTOWN MD
2021-04-21 667-317-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PRINCEANNE MD
2021-03-22 667-306-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-03-22 667-306-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-02-23 667-895-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-02-23 667-895-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-09-04 667-288-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BERLIN MD
2020-08-03 667-284-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-08-03 667-284-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-08-03 667-284-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-08-03 667-284-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-08-03 667-284-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-08-03 667-284-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-08-03 667-284-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-06-30 667-900-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-05-19 667-262-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-04-07 667-930-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-04-01 667-776-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-04-01 667-776-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-04-01 667-776-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-04-01 667-776-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2020-04-01 667-776-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD

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.