NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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, last 30 days — NPA 385
LEVEL 3 COMMUNICATIONS, LLC - UT 5
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
2026-09-15 385-641-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2026-09-15 385-641-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2026-09-15 385-641-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2026-09-15 385-641-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2026-09-15 385-641-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2023-12-13 385-548-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2023-08-08 385-541-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2023-05-22 385-478-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2023-05-04 385-531-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2023-05-04 385-531-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2023-05-04 385-531-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2023-05-04 385-531-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2022-07-27 385-622-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2022-06-14 385-563-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2022-04-20 385-384-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 PROVO UT
2022-03-07 385-563-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2022-02-16 385-488-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2022-02-14 385-566-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 KAYSVILLE UT
2021-08-10 385-488-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2021-04-27 385-378-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MURRAY UT
2021-03-23 385-361-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2021-01-26 385-855-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2020-06-24 385-301-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2020-06-24 385-353-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 AMERCNFORK UT
2020-06-09 385-338-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 LEHI UT
2020-06-04 385-340-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 BOUNTIFUL UT
2020-05-21 385-344-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SPANIHFORK UT
2020-05-21 385-344-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SPANIHFORK UT
2020-05-21 385-344-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SPANIHFORK UT
2020-05-19 385-341-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2020-05-05 385-342-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
2020-04-21 385-326-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 OGDEN UT
2020-03-31 385-479-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2020-02-25 385-421-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 ALTA UT
2020-01-22 385-316-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 FARMINGTON UT
2019-12-17 385-306-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 KAYSVILLE UT
2019-08-27 385-799-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2019-08-27 385-799-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2019-06-28 385-432-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 OGDEN UT
2019-06-25 385-284-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MORGAN UT
2019-05-22 385-421-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 ALTA UT
2019-03-11 385-437-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SPANIHFORK UT
2019-02-27 385-387-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 AMERCNFORK UT
2018-11-08 385-295-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2018-11-08 385-295-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2018-09-05 385-420-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2018-03-29 385-666-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 PROVO UT
2017-10-11 385-279-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 OGDEN UT
2016-08-03 385-256-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2016-04-20 385-258-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT

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.