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
2020-09-16 331-867-7XXX 7000–7999Assigned ONVOY, LLC 224C YORKVILLE IL
2020-09-16 331-867-9XXX 9000–9999Assigned ONVOY, LLC 224C YORKVILLE IL
2020-09-16 331-946-7XXX 7000–7999Assigned ONVOY, LLC 224C GLEN ELLYN IL
2020-09-16 331-946-8XXX 8000–8999Assigned ONVOY, LLC 224C GLEN ELLYN IL
2020-09-15 331-260-5XXX 5000–5999Assigned VONAGE AMERICA LLC 197D DOWNERSGRV IL
2020-09-15 331-260-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D DOWNERSGRV IL
2020-09-14 331-258-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D AURORA IL
2020-09-14 331-258-9XXX 9000–9999Assigned VONAGE AMERICA LLC 197D AURORA IL
2020-09-14 331-264-9XXX 9000–9999Assigned STRATUS NETWORKS 495J HINSDALE IL
2020-09-11 331-265-0XXX 0000–0999Assigned STRATUS NETWORKS 495J GENEVA IL
2020-09-08 331-257-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2020-09-08 331-257-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2020-09-05 331-348-0XXX 0000–0999Assigned STRATUS NETWORKS 495J ELBURN IL
2020-09-05 331-867-0XXX 0000–0999Assigned STRATUS NETWORKS 495J YORKVILLE IL
2020-09-05 331-946-0XXX 0000–0999Assigned STRATUS NETWORKS 495J GLEN ELLYN IL
2020-09-03 331-264-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 HINSDALE IL
2020-08-31 331-232-8XXX 8000–8999Assigned STRATUS NETWORKS 495J W CHICAGO IL
2020-08-31 331-252-8XXX 8000–8999Assigned STRATUS NETWORKS 495J WARRENVL IL
2020-08-31 331-259-0XXX 0000–0999Assigned STRATUS NETWORKS 495J SUGARGROVE IL
2020-08-31 331-266-0XXX 0000–0999Assigned STRATUS NETWORKS 495J ST CHARLES IL
2020-08-31 331-600-1XXX 1000–1999Assigned STRATUS NETWORKS 495J WHEATON IL
2020-08-30 331-249-9XXX 9000–9999Assigned STRATUS NETWORKS 495J NAPERVILLE IL
2020-08-30 331-261-0XXX 0000–0999Assigned STRATUS NETWORKS 495J LEMONT IL
2020-08-30 331-263-9XXX 9000–9999Assigned STRATUS NETWORKS 495J ITASCA IL
2020-08-30 331-400-8XXX 8000–8999Assigned STRATUS NETWORKS 495J OSWEGO IL
2020-08-30 331-704-9XXX 9000–9999Assigned STRATUS NETWORKS 495J KANEVILLE IL
2020-08-30 331-808-7XXX 7000–7999Assigned STRATUS NETWORKS 495J PLANO IL
2020-08-29 331-243-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2020-08-28 331-900-8XXX 8000–8999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ELMHURST IL
2020-08-26 331-666-9XXX 9000–9999Assigned STRATUS NETWORKS 495J AURORA IL
2020-08-18 331-264-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HINSDALE IL
2020-08-10 331-241-6XXX 6000–6999Assigned ONVOY, LLC 224C LOMBARD IL
2020-08-10 331-241-7XXX 7000–7999Assigned ONVOY, LLC 224C LOMBARD IL
2020-08-10 331-264-4XXX 4000–4999Assigned ONVOY, LLC 224C HINSDALE IL
2020-08-10 331-264-6XXX 6000–6999Assigned ONVOY, LLC 224C HINSDALE IL
2020-08-10 331-310-4XXX 4000–4999Assigned ONVOY, LLC 224C BIG ROCK IL
2020-08-10 331-946-6XXX 6000–6999Assigned ONVOY, LLC 224C GLEN ELLYN IL
2020-08-10 331-946-9XXX 9000–9999Assigned ONVOY, LLC 224C GLEN ELLYN IL
2020-08-08 331-259-8XXX 8000–8999Assigned ONVOY, LLC 224C SUGARGROVE IL
2020-08-08 331-259-9XXX 9000–9999Assigned ONVOY, LLC 224C SUGARGROVE IL
2020-08-08 331-265-6XXX 6000–6999Assigned ONVOY, LLC 224C GENEVA IL
2020-08-08 331-265-7XXX 7000–7999Assigned ONVOY, LLC 224C GENEVA IL
2020-08-08 331-867-6XXX 6000–6999Assigned ONVOY, LLC 224C YORKVILLE IL
2020-08-08 331-867-8XXX 8000–8999Assigned ONVOY, LLC 224C YORKVILLE IL
2020-07-28 331-257-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2020-07-15 331-867-5XXX 5000–5999Assigned FRACTEL, LLC 965H YORKVILLE IL
2020-07-15 331-946-3XXX 3000–3999Assigned FRACTEL, LLC 965H GLEN ELLYN IL
2020-07-09 331-266-6XXX 6000–6999Assigned FRACTEL, LLC 965H ST CHARLES IL
2020-07-08 331-356-9XXX 9000–9999Assigned FRACTEL, LLC 965H BARTLETT IL
2020-06-18 331-263-6XXX 6000–6999Assigned ONVOY, LLC 224C ITASCA 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.