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 571
LEVEL 3 COMMUNICATIONS, LLC - VA 218
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
2026-05-07 571-763-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2026-05-07 571-763-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2022-04-27 571-547-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2022-03-31 571-547-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2022-02-16 571-622-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2021-01-26 571-473-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2020-08-04 571-601-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2020-08-03 571-621-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2020-07-28 571-521-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2020-04-28 571-430-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2020-03-05 571-430-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2020-03-05 571-430-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2019-12-20 571-496-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LORTONMTRO VA
2019-12-12 571-400-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2019-10-23 571-498-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2019-08-16 571-685-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2019-08-14 571-695-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2019-08-08 571-440-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2019-08-02 571-415-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HAYMARKET VA
2019-07-31 571-400-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2019-06-11 571-685-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2019-05-01 571-401-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2019-04-24 571-347-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2019-04-24 571-666-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2019-03-29 571-833-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2019-03-29 571-833-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2019-03-19 571-491-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DULLES VA
2019-01-08 571-397-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2018-08-16 571-523-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2018-05-31 571-347-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2018-01-24 571-378-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2017-12-29 571-495-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
2017-12-22 571-378-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2017-10-25 571-831-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2017-10-02 571-495-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
2017-10-02 571-495-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
2017-06-06 571-260-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2016-10-11 571-525-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2016-06-13 571-260-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2016-06-07 571-707-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2015-12-17 571-444-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2015-10-14 571-341-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA

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.