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
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
2021-08-02 331-270-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2021-08-02 331-270-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2021-08-02 331-270-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 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
2021-07-28 331-341-2XXX 2000–2999Assigned ONVOY, LLC 224C PLANO IL
2021-07-28 331-341-3XXX 3000–3999Assigned ONVOY, LLC 224C PLANO IL
2021-07-27 331-272-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-07-27 331-272-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-07-20 331-270-2XXX 2000–2999Assigned ONVOY, LLC 224C AURORA IL
2021-07-19 331-336-0XXX 0000–0999Assigned ONVOY, LLC 224C AURORA IL
2021-07-19 331-336-1XXX 1000–1999Assigned ONVOY, LLC 224C AURORA IL
2021-07-19 331-336-9XXX 9000–9999Assigned ONVOY, LLC 224C AURORA IL
2021-07-15 331-272-2XXX 2000–2999Assigned ONVOY, LLC 224C ST CHARLES IL
2021-07-15 331-272-3XXX 3000–3999Assigned ONVOY, LLC 224C ST CHARLES IL
2021-07-15 331-272-4XXX 4000–4999Assigned ONVOY, LLC 224C ST CHARLES IL
2021-07-15 331-272-5XXX 5000–5999Assigned ONVOY, LLC 224C ST CHARLES IL
2021-07-14 331-400-2XXX 2000–2999Assigned ONVOY, LLC 224C OSWEGO IL
2021-07-14 331-400-6XXX 6000–6999Assigned ONVOY, LLC 224C OSWEGO IL
2021-07-14 331-400-7XXX 7000–7999Assigned ONVOY, LLC 224C OSWEGO IL
2021-07-13 331-348-4XXX 4000–4999Assigned ONVOY, LLC 224C ELBURN IL
2021-07-13 331-348-7XXX 7000–7999Assigned ONVOY, LLC 224C ELBURN IL
2021-07-13 331-850-5XXX 5000–5999Assigned ONVOY, LLC 224C BIG ROCK IL
2021-07-07 331-900-7XXX 7000–7999Assigned TELNYX LLC 073H ELMHURST IL
2021-06-25 331-304-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BARTLETT IL
2021-06-25 331-356-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BARTLETT IL
2021-06-25 331-356-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BARTLETT IL
2021-06-25 331-356-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BARTLETT IL
2021-06-25 331-356-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BARTLETT IL
2021-06-25 331-788-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 GENEVA IL
2021-06-25 331-788-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 GENEVA IL
2021-06-15 331-334-0XXX 0000–0999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E BATAVIA IL
2021-06-09 331-273-3XXX 3000–3999Assigned ONVOY, LLC 224C LEMONT IL
2021-06-08 331-261-4XXX 4000–4999Assigned ONVOY, LLC 224C LEMONT IL
2021-06-08 331-261-5XXX 5000–5999Assigned ONVOY, LLC 224C LEMONT IL
2021-06-08 331-261-6XXX 6000–6999Assigned ONVOY, LLC 224C LEMONT IL
2021-06-08 331-334-4XXX 4000–4999Assigned ONVOY, LLC 224C BATAVIA IL
2021-06-08 331-334-5XXX 5000–5999Assigned ONVOY, LLC 224C BATAVIA IL
2021-06-08 331-334-6XXX 6000–6999Assigned ONVOY, LLC 224C BATAVIA IL
2021-06-08 331-334-7XXX 7000–7999Assigned ONVOY, LLC 224C BATAVIA IL
2021-06-04 331-269-1XXX 1000–1999Assigned ONVOY, LLC 224C AURORA IL
2021-06-04 331-269-2XXX 2000–2999Assigned ONVOY, LLC 224C AURORA IL
2021-06-04 331-269-3XXX 3000–3999Assigned ONVOY, LLC 224C AURORA IL
2021-06-03 331-268-0XXX 0000–0999Assigned IP HORIZON LLC 515J SUGARGROVE IL
2021-06-03 331-341-1XXX 1000–1999Assigned IP HORIZON LLC 515J PLANO IL
2021-06-03 331-500-8XXX 8000–8999Assigned IP HORIZON LLC 515J GENEVA IL
2021-06-03 331-867-1XXX 1000–1999Assigned IP HORIZON LLC 515J YORKVILLE IL
2021-06-02 331-348-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H ELBURN 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.