NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

11 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 331
ONVOY, LLC 6
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 3
NEW CINGULAR WIRELESS PCS, LLC - IL 1
BANDWIDTH.COM CLEC, LLC - IL 1
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
2022-02-25 331-373-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J OSWEGO IL
2022-02-25 331-627-7XXX 7000–7999Assigned TON80 COMMUNICATIONS, LLC 516J LOMBARD IL
2022-02-23 331-283-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 GENEVA IL
2022-02-18 331-252-7XXX 7000–7999Assigned TON80 COMMUNICATIONS, LLC 516J WARRENVL IL
2022-02-18 331-426-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J LEMONT IL
2022-02-17 331-282-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HINSDALE IL
2022-02-17 331-288-8XXX 8000–8999Assigned TON80 COMMUNICATIONS, LLC 516J ELBURN IL
2022-02-17 331-466-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J GLEN ELLYN IL
2022-02-17 331-688-8XXX 8000–8999Assigned TON80 COMMUNICATIONS, LLC 516J NAPERVILLE IL
2022-02-17 331-746-7XXX 7000–7999Assigned TON80 COMMUNICATIONS, LLC 516J KANEVILLE IL
2022-02-16 331-272-6XXX 6000–6999Assigned TON80 COMMUNICATIONS, LLC 516J ST CHARLES IL
2022-02-01 331-270-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2022-01-28 331-388-7XXX 7000–7999Assigned ONVOY, LLC 224C SUGARGROVE IL
2022-01-27 331-280-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H DOWNERSGRV IL
2022-01-26 331-850-1XXX 1000–1999Assigned COMMIO, LLC 939H BIG ROCK IL
2022-01-25 331-277-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2022-01-13 331-866-2XXX 2000–2999Assigned TON80 COMMUNICATIONS, LLC 516J WHEATON IL
2022-01-08 331-282-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2022-01-08 331-282-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2022-01-07 331-837-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J W CHICAGO IL
2022-01-05 331-278-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2021-12-29 331-280-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2021-12-29 331-280-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2021-12-29 331-280-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2021-12-29 331-345-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2021-12-29 331-529-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2021-12-10 331-282-2XXX 2000–2999Assigned ONVOY, LLC 224C HINSDALE IL
2021-12-10 331-282-3XXX 3000–3999Assigned ONVOY, LLC 224C HINSDALE IL
2021-12-10 331-282-4XXX 4000–4999Assigned ONVOY, LLC 224C HINSDALE IL
2021-12-01 331-277-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2021-11-29 331-788-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E GENEVA IL
2021-11-22 331-279-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ELMHURST IL
2021-11-19 331-272-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-11-19 331-272-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-11-04 331-268-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2021-10-28 331-348-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H ELBURN IL
2021-10-27 331-758-6XXX 6000–6999Assigned FRACTEL, LLC 965H AURORA IL
2021-10-27 331-788-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H GENEVA IL
2021-10-27 331-788-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H GENEVA IL
2021-10-27 331-800-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H W CHICAGO IL
2021-10-27 331-800-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H W CHICAGO IL
2021-10-21 331-273-4XXX 4000–4999Assigned ONVOY, LLC 224C LEMONT IL
2021-10-21 331-273-5XXX 5000–5999Assigned ONVOY, LLC 224C LEMONT IL
2021-10-21 331-273-6XXX 6000–6999Assigned ONVOY, LLC 224C LEMONT IL
2021-10-20 331-500-2XXX 2000–2999Assigned ONVOY, LLC 224C GENEVA IL
2021-10-20 331-500-3XXX 3000–3999Assigned ONVOY, LLC 224C GENEVA IL
2021-10-20 331-500-4XXX 4000–4999Assigned ONVOY, LLC 224C GENEVA IL
2021-10-18 331-260-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H DOWNERSGRV IL
2021-10-18 331-260-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H DOWNERSGRV IL
2021-10-18 331-399-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H DOWNERSGRV 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.