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 520
PEERLESS NETWORK OF ARIZONA, LLC - AZ 119
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
2026-07-24 520-368-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2026-07-24 520-924-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2024-01-17 520-703-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2023-09-21 520-680-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2023-07-11 520-435-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2023-07-11 520-654-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SIERRAVIST AZ
2023-07-11 520-679-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TOMBSTONE AZ
2023-06-13 520-641-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BENSON AZ
2023-06-13 520-657-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2023-06-13 520-677-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2023-03-16 520-608-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2023-02-17 520-656-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2023-02-17 520-659-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2023-02-17 520-702-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2023-02-17 520-772-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SUPERIOR AZ
2023-01-24 520-557-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2023-01-24 520-590-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2023-01-24 520-652-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2023-01-24 520-657-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2023-01-19 520-540-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2022-11-22 520-657-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2022-04-18 520-593-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2022-04-15 520-652-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2022-03-03 520-614-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2022-03-03 520-699-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SIERRAVIST AZ
2022-02-25 520-641-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BENSON AZ
2022-02-18 520-581-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TOMBSTONE AZ
2022-02-18 520-590-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2022-02-18 520-607-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2022-02-18 520-608-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2022-02-18 520-980-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2022-01-25 520-772-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SUPERIOR AZ
2022-01-24 520-630-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2022-01-24 520-702-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2021-12-28 520-699-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SIERRAVIST AZ
2021-11-20 520-583-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2021-10-21 520-598-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2021-08-25 520-541-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2021-06-15 520-552-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2021-06-11 520-543-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2021-04-30 520-521-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2021-04-30 520-536-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2021-02-19 520-860-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2021-01-19 520-521-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2021-01-19 520-637-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2021-01-08 520-536-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2021-01-08 520-593-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2021-01-07 520-503-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2020-12-07 520-386-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BENSON AZ
2020-12-07 520-453-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TOMBSTONE AZ

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.