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
2013-02-11 331-216-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
2013-02-08 331-214-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2013-02-05 331-208-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-12-17 331-209-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELMHURST IL
2012-12-17 331-215-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NAPERVILLE IL
2012-12-14 331-208-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 AURORA IL
2012-12-07 331-251-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-11-30 331-214-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DOWNERSGRV IL
2012-11-30 331-229-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-11-29 331-201-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-11-29 331-214-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-11-27 331-200-3XXX 3000–3999Assigned ONVOY, LLC 224C BARTLETT IL
2012-11-23 331-215-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-11-21 331-212-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J AURORA IL
2012-11-20 331-201-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2012-11-15 331-200-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E BARTLETT IL
2012-11-15 331-208-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 AURORA IL
2012-11-15 331-208-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 AURORA IL
2012-11-15 331-209-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2012-11-15 331-444-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2012-11-14 331-777-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 DOWNERSGRV IL
2012-11-01 331-216-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
2012-10-26 331-281-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-26 331-281-9XXX 9000–9999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2012-10-12 331-210-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2012-10-12 331-223-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2012-10-03 331-215-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-09-28 331-777-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DOWNERSGRV IL
2012-09-26 331-201-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2012-09-25 331-444-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-09-24 331-225-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ELMHURST IL
2012-09-24 331-225-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ELMHURST IL
2012-09-14 331-422-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2012-09-14 331-588-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2012-09-13 331-999-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E OSWEGO IL
2012-09-05 331-248-6XXX 6000–6999Assigned ONVOY, LLC 224C GENEVA IL
2012-08-31 331-207-3XXX 3000–3999Assigned ONVOY, LLC 224C YORKVILLE IL
2012-08-31 331-210-0XXX 0000–0999Assigned ONVOY, LLC 224C ST CHARLES IL
2012-08-31 331-214-3XXX 3000–3999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2012-08-31 331-225-1XXX 1000–1999Assigned ONVOY, LLC 224C ELMHURST IL
2012-08-31 331-444-7XXX 7000–7999Assigned ONVOY, LLC 224C NAPERVILLE IL
2012-08-31 331-999-6XXX 6000–6999Assigned ONVOY, LLC 224C OSWEGO IL
2012-08-24 331-201-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2012-08-24 331-207-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E YORKVILLE 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.