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
2022-09-13 331-277-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2022-09-13 331-290-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2022-09-13 331-290-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2022-09-01 331-284-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E BARTLETT IL
2022-09-01 331-426-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E LEMONT IL
2022-08-30 331-600-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 WHEATON IL
2022-08-30 331-600-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 WHEATON IL
2022-08-26 331-290-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2022-08-26 331-290-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2022-08-26 331-290-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2022-08-26 331-291-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-08-26 331-291-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-08-26 331-291-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-08-22 331-209-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-08-16 331-287-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H AURORA IL
2022-08-16 331-287-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H AURORA IL
2022-08-16 331-287-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H AURORA IL
2022-08-16 331-287-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H AURORA IL
2022-08-16 331-287-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H AURORA IL
2022-08-16 331-313-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H NAPERVILLE IL
2022-08-16 331-313-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H NAPERVILLE IL
2022-08-16 331-313-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H NAPERVILLE IL
2022-08-16 331-313-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H NAPERVILLE IL
2022-08-16 331-313-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H NAPERVILLE IL
2022-08-15 331-289-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2022-08-15 331-289-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2022-08-11 331-299-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2022-08-09 331-334-1XXX 1000–1999Assigned TELNYX LLC 073H BATAVIA IL
2022-08-04 331-279-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-08-04 331-279-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-08-04 331-279-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-07-27 331-282-7XXX 7000–7999Assigned ONVOY, LLC 224C HINSDALE IL
2022-07-20 331-287-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-287-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-287-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-287-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-837-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E W CHICAGO IL
2022-07-20 331-837-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E W CHICAGO IL
2022-07-19 331-758-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-15 331-286-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2022-07-15 331-286-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2022-07-14 331-631-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-07-14 331-631-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-07-14 331-631-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-07-14 331-631-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2022-07-07 331-285-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2022-07-07 331-285-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2022-07-07 331-285-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2022-07-07 331-631-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H DOWNERSGRV IL
2022-07-07 331-631-7XXX 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.