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
2019-06-18 331-717-4XXX 4000–4999Assigned ONVOY, LLC 224C OSWEGO IL
2019-06-18 331-717-5XXX 5000–5999Assigned ONVOY, LLC 224C OSWEGO IL
2019-06-18 331-999-9XXX 9000–9999Assigned ONVOY, LLC 224C OSWEGO IL
2019-06-10 331-236-5XXX 5000–5999Assigned ONVOY, LLC 224C WHEATON IL
2019-06-10 331-236-6XXX 6000–6999Assigned ONVOY, LLC 224C WHEATON IL
2019-06-10 331-241-8XXX 8000–8999Assigned ONVOY, LLC 224C LOMBARD IL
2019-06-10 331-241-9XXX 9000–9999Assigned ONVOY, LLC 224C LOMBARD IL
2019-06-10 331-246-0XXX 0000–0999Assigned ONVOY, LLC 224C LEMONT IL
2019-06-10 331-246-1XXX 1000–1999Assigned ONVOY, LLC 224C LEMONT IL
2019-06-10 331-249-2XXX 2000–2999Assigned ONVOY, LLC 224C NAPERVILLE IL
2019-06-10 331-249-3XXX 3000–3999Assigned ONVOY, LLC 224C NAPERVILLE IL
2019-06-10 331-249-4XXX 4000–4999Assigned ONVOY, LLC 224C NAPERVILLE IL
2019-06-10 331-249-5XXX 5000–5999Assigned ONVOY, LLC 224C NAPERVILLE IL
2019-06-10 331-260-0XXX 0000–0999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2019-06-10 331-260-8XXX 8000–8999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2019-06-10 331-260-9XXX 9000–9999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2019-05-09 331-258-2XXX 2000–2999Assigned ONVOY, LLC 224C AURORA IL
2019-05-09 331-666-5XXX 5000–5999Assigned ONVOY, LLC 224C AURORA IL
2019-05-09 331-666-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2019-03-25 331-233-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DOWNERSGRV IL
2019-03-11 331-239-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 YORKVILLE IL
2019-02-26 331-260-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2018-12-27 331-249-8XXX 8000–8999Assigned TELNYX LLC 073H NAPERVILLE IL
2018-12-19 331-219-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2018-12-19 331-247-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2018-12-07 331-249-0XXX 0000–0999Assigned ONVOY, LLC 224C NAPERVILLE IL
2018-12-07 331-249-1XXX 1000–1999Assigned ONVOY, LLC 224C NAPERVILLE IL
2018-12-03 331-239-1XXX 1000–1999Assigned ONVOY, LLC 224C YORKVILLE IL
2018-11-30 331-235-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2018-11-23 331-247-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-1XXX 1000–1999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-2XXX 2000–2999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-4XXX 4000–4999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-5XXX 5000–5999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-7XXX 7000–7999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-23 331-247-8XXX 8000–8999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-20 331-231-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D NAPERVILLE IL
2018-11-14 331-236-1XXX 1000–1999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E WHEATON IL
2018-11-09 331-238-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2018-11-09 331-238-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2018-11-06 331-808-4XXX 4000–4999Assigned ONVOY, LLC 224C PLANO IL
2018-10-29 331-233-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J DOWNERSGRV IL
2018-10-29 331-239-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E YORKVILLE IL
2018-10-22 331-242-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LOMBARD IL
2018-10-22 331-242-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LOMBARD IL
2018-10-22 331-242-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LOMBARD IL
2018-10-22 331-242-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LOMBARD IL
2018-10-22 331-242-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LOMBARD 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.