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 307
LEVEL 3 COMMUNICATIONS, LLC - WY 109
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
2024-06-25 307-452-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 CASPER WY
2024-06-18 307-453-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 JACKSON WY
2024-03-27 307-757-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 CHEYENNE WY
2023-10-17 307-295-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 TORRINGTON WY
2023-09-12 307-294-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2023-09-12 307-336-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DANIEL WY
2023-09-12 307-416-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2023-08-25 307-408-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 LYMAN WY
2023-07-19 307-463-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 RIVERTON WY
2023-05-24 307-416-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2023-05-19 307-456-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2023-05-17 307-949-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 NEWCASTLE WY
2023-02-08 307-281-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 SUNDANCE WY
2023-02-08 307-431-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 WORLAND WY
2023-01-06 307-900-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 GLENDO WY
2023-01-03 307-318-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 WRIGHT WY
2023-01-03 307-336-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DANIEL WY
2023-01-03 307-355-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 LA GRANGE WY
2023-01-03 307-384-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 AFTON WY
2023-01-03 307-403-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 MORAN WY
2023-01-03 307-404-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 MEDICINBOW WY
2023-01-03 307-407-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 WSPEARFISH WY
2023-01-03 307-456-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2023-01-03 307-770-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 FARSON WY
2023-01-03 307-785-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 WBLLFOURCH WY
2023-01-03 307-788-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 WEST LYMAN WY
2023-01-03 307-888-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 OLDFATHFUL WY
2022-12-14 307-293-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 GUERNSEY WY
2022-09-28 307-456-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2021-07-27 307-459-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 CHEYENNE WY
2021-06-11 307-336-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DANIEL WY
2021-06-10 307-456-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2021-04-28 307-323-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2020-11-19 307-323-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2020-11-19 307-323-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2020-11-19 307-336-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DANIEL WY
2020-11-19 307-456-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2020-11-19 307-456-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2020-10-29 307-263-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 CHEYENNE WY
2020-08-06 307-323-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2020-08-06 307-323-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2020-08-06 307-336-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DANIEL WY
2020-08-06 307-456-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2020-08-03 307-288-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 EVANSTON WY
2020-08-03 307-364-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 GREENRIVER WY
2020-07-09 307-323-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2020-06-04 307-218-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 SHERIDAN WY
2020-06-04 307-487-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 GILLETTE WY
2020-05-05 307-243-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 CASPER WY
2020-05-05 307-263-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 CHEYENNE WY

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.