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 331
COMMIO, LLC 44
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
2024-01-05 331-317-0XXX 0000–0999Assigned COMMIO, LLC 939H HINSDALE IL
2024-01-05 331-317-1XXX 1000–1999Assigned COMMIO, LLC 939H HINSDALE IL
2024-01-05 331-317-2XXX 2000–2999Assigned COMMIO, LLC 939H HINSDALE IL
2024-01-05 331-317-3XXX 3000–3999Assigned COMMIO, LLC 939H HINSDALE IL
2024-01-04 331-217-5XXX 5000–5999Assigned COMMIO, LLC 939H LOMBARD IL
2024-01-04 331-217-6XXX 6000–6999Assigned COMMIO, LLC 939H LOMBARD IL
2024-01-04 331-217-7XXX 7000–7999Assigned COMMIO, LLC 939H LOMBARD IL
2024-01-04 331-217-8XXX 8000–8999Assigned COMMIO, LLC 939H LOMBARD IL
2024-01-04 331-288-5XXX 5000–5999Assigned COMMIO, LLC 939H ELBURN IL
2024-01-04 331-288-6XXX 6000–6999Assigned COMMIO, LLC 939H ELBURN IL
2024-01-04 331-309-1XXX 1000–1999Assigned COMMIO, LLC 939H LEMONT IL
2024-01-04 331-309-2XXX 2000–2999Assigned COMMIO, LLC 939H LEMONT IL
2024-01-04 331-309-3XXX 3000–3999Assigned COMMIO, LLC 939H LEMONT IL
2024-01-04 331-309-4XXX 4000–4999Assigned COMMIO, LLC 939H LEMONT IL
2024-01-04 331-309-8XXX 8000–8999Assigned COMMIO, LLC 939H LEMONT IL
2024-01-04 331-316-0XXX 0000–0999Assigned COMMIO, LLC 939H NAPERVILLE IL
2024-01-04 331-316-1XXX 1000–1999Assigned COMMIO, LLC 939H NAPERVILLE IL
2024-01-04 331-758-8XXX 8000–8999Assigned COMMIO, LLC 939H AURORA IL
2023-07-21 331-288-0XXX 0000–0999Assigned COMMIO, LLC 939H ELBURN IL
2023-07-21 331-288-1XXX 1000–1999Assigned COMMIO, LLC 939H ELBURN IL
2023-07-21 331-288-2XXX 2000–2999Assigned COMMIO, LLC 939H ELBURN IL
2023-07-21 331-288-3XXX 3000–3999Assigned COMMIO, LLC 939H ELBURN IL
2023-07-21 331-288-4XXX 4000–4999Assigned COMMIO, LLC 939H ELBURN IL
2022-01-26 331-850-1XXX 1000–1999Assigned COMMIO, LLC 939H BIG ROCK IL
2021-09-14 331-271-0XXX 0000–0999Assigned COMMIO, LLC 939H HINSDALE IL
2021-09-14 331-273-0XXX 0000–0999Assigned COMMIO, LLC 939H LEMONT IL
2021-09-14 331-273-1XXX 1000–1999Assigned COMMIO, LLC 939H LEMONT IL
2021-09-14 331-273-2XXX 2000–2999Assigned COMMIO, LLC 939H LEMONT IL
2021-09-14 331-273-7XXX 7000–7999Assigned COMMIO, LLC 939H LEMONT IL
2021-09-14 331-273-8XXX 8000–8999Assigned COMMIO, LLC 939H LEMONT IL
2021-09-14 331-277-0XXX 0000–0999Assigned COMMIO, LLC 939H LOMBARD IL
2021-09-14 331-277-1XXX 1000–1999Assigned COMMIO, LLC 939H LOMBARD IL
2021-09-14 331-277-2XXX 2000–2999Assigned COMMIO, LLC 939H LOMBARD IL
2021-09-14 331-277-3XXX 3000–3999Assigned COMMIO, LLC 939H LOMBARD IL
2021-09-14 331-345-1XXX 1000–1999Assigned COMMIO, LLC 939H NAPERVILLE IL
2021-09-14 331-345-2XXX 2000–2999Assigned COMMIO, LLC 939H NAPERVILLE IL
2021-09-14 331-345-5XXX 5000–5999Assigned COMMIO, LLC 939H NAPERVILLE IL
2021-09-14 331-345-7XXX 7000–7999Assigned COMMIO, LLC 939H NAPERVILLE IL
2021-09-14 331-345-8XXX 8000–8999Assigned COMMIO, LLC 939H NAPERVILLE IL
2021-08-02 331-270-0XXX 0000–0999Assigned COMMIO, LLC 939H AURORA IL
2021-08-02 331-270-1XXX 1000–1999Assigned COMMIO, LLC 939H AURORA IL
2021-08-02 331-270-4XXX 4000–4999Assigned COMMIO, LLC 939H AURORA IL
2021-08-02 331-270-8XXX 8000–8999Assigned COMMIO, LLC 939H AURORA IL
2021-08-02 331-270-9XXX 9000–9999Assigned COMMIO, LLC 939H AURORA IL

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.