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
2021-01-15 331-268-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SUGARGROVE IL
2021-01-12 331-259-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SUGARGROVE IL
2021-01-12 331-259-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SUGARGROVE IL
2021-01-12 331-271-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2021-01-12 331-271-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2021-01-12 331-271-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2021-01-12 331-271-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2021-01-12 331-299-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2021-01-07 331-265-1XXX 1000–1999Assigned ONVOY, LLC 224C GENEVA IL
2021-01-07 331-265-2XXX 2000–2999Assigned ONVOY, LLC 224C GENEVA IL
2021-01-07 331-265-8XXX 8000–8999Assigned ONVOY, LLC 224C GENEVA IL
2021-01-07 331-265-9XXX 9000–9999Assigned ONVOY, LLC 224C GENEVA IL
2021-01-05 331-299-9XXX 9000–9999Assigned FRACTEL, LLC 965H HINSDALE IL
2021-01-05 331-500-0XXX 0000–0999Assigned FRACTEL, LLC 965H GENEVA IL
2021-01-04 331-260-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2020-12-23 331-899-9XXX 9000–9999Assigned FRACTEL, LLC 965H LOMBARD IL
2020-12-15 331-257-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2020-12-15 331-258-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2020-12-08 331-267-4XXX 4000–4999Assigned ONVOY, LLC 224C LOMBARD IL
2020-12-08 331-267-5XXX 5000–5999Assigned ONVOY, LLC 224C LOMBARD IL
2020-12-08 331-267-6XXX 6000–6999Assigned ONVOY, LLC 224C LOMBARD IL
2020-12-08 331-267-7XXX 7000–7999Assigned ONVOY, LLC 224C LOMBARD IL
2020-12-08 331-267-8XXX 8000–8999Assigned ONVOY, LLC 224C LOMBARD IL
2020-12-07 331-775-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2020-11-23 331-271-8XXX 8000–8999Assigned NUSO, LLC 478J HINSDALE IL
2020-11-23 331-271-9XXX 9000–9999Assigned NUSO, LLC 478J HINSDALE IL
2020-11-19 331-345-6XXX 6000–6999Assigned FRACTEL, LLC 965H NAPERVILLE IL
2020-11-16 331-946-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E GLEN ELLYN IL
2020-11-13 331-310-5XXX 5000–5999Assigned STRATUS NETWORKS 495J BIG ROCK IL
2020-11-04 331-529-5XXX 5000–5999Assigned ONVOY, LLC 224C NAPERVILLE IL
2020-11-04 331-529-6XXX 6000–6999Assigned ONVOY, LLC 224C NAPERVILLE IL
2020-11-04 331-529-7XXX 7000–7999Assigned ONVOY, LLC 224C NAPERVILLE IL
2020-11-04 331-529-8XXX 8000–8999Assigned ONVOY, LLC 224C NAPERVILLE IL
2020-10-28 331-271-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E HINSDALE IL
2020-10-22 331-271-1XXX 1000–1999Assigned ONVOY, LLC 224C HINSDALE IL
2020-10-22 331-271-2XXX 2000–2999Assigned ONVOY, LLC 224C HINSDALE IL
2020-10-21 331-666-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2020-10-12 331-348-1XXX 1000–1999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ELBURN IL
2020-09-28 331-304-6XXX 6000–6999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E BARTLETT IL
2020-09-24 331-260-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2020-09-21 331-267-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D LOMBARD IL
2020-09-21 331-267-9XXX 9000–9999Assigned VONAGE AMERICA LLC 197D LOMBARD IL
2020-09-16 331-236-2XXX 2000–2999Assigned VONAGE AMERICA LLC 197D WHEATON IL
2020-09-16 331-236-4XXX 4000–4999Assigned VONAGE AMERICA LLC 197D WHEATON IL
2020-09-16 331-266-2XXX 2000–2999Assigned VONAGE AMERICA LLC 197D ST CHARLES IL
2020-09-16 331-266-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D ST CHARLES IL
2020-09-16 331-336-4XXX 4000–4999Assigned ONVOY, LLC 224C AURORA IL
2020-09-16 331-336-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2020-09-16 331-356-1XXX 1000–1999Assigned VONAGE AMERICA LLC 197D BARTLETT IL
2020-09-16 331-356-5XXX 5000–5999Assigned VONAGE AMERICA LLC 197D BARTLETT 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.