NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

11 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2012-08-23 331-777-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-08-20 331-250-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2012-08-20 331-250-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2012-08-17 331-212-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J AURORA IL
2012-08-15 331-999-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
2012-08-03 331-422-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ST CHARLES IL
2012-07-16 331-205-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2012-07-16 331-213-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E NAPERVILLE IL
2012-06-21 331-214-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-06-21 331-214-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-06-19 331-777-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 DOWNERSGRV IL
2012-06-18 331-212-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-06-18 331-212-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-06-18 331-212-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-06-18 331-213-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2012-06-18 331-228-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J ST CHARLES IL
2012-06-06 331-213-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J NAPERVILLE IL
2012-06-04 331-212-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L AURORA IL
2012-05-24 331-212-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 AURORA IL
2012-05-18 331-588-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2012-05-17 331-209-3XXX 3000–3999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L ELMHURST IL
2012-05-17 331-999-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
2012-05-14 331-213-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-05-14 331-213-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-05-14 331-223-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2012-05-02 331-213-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-05-02 331-213-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2012-05-02 331-228-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2012-04-27 331-200-4XXX 4000–4999Assigned ONVOY, LLC 224C BARTLETT IL
2012-04-24 331-228-2XXX 2000–2999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ST CHARLES IL
2012-04-24 331-228-3XXX 3000–3999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ST CHARLES IL
2012-04-24 331-228-4XXX 4000–4999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ST CHARLES IL
2012-04-24 331-228-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ST CHARLES IL
2012-04-24 331-228-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J ST CHARLES IL
2012-04-23 331-201-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-04-23 331-201-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-04-06 331-212-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 AURORA IL
2012-04-05 331-999-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J OSWEGO IL
2012-04-02 331-213-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E NAPERVILLE IL
2012-04-02 331-223-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2012-03-30 331-201-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2012-03-22 331-201-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E DOWNERSGRV IL
2012-03-22 331-209-2XXX 2000–2999Assigned ACCESS ONE, INC. - IL 5447 ELMHURST IL
2012-03-08 331-210-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ST CHARLES IL
2012-03-01 331-248-4XXX 4000–4999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E GENEVA IL
2012-03-01 331-256-8XXX 8000–8999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E AURORA IL
2012-02-14 331-205-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2012-02-14 331-205-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2012-02-03 331-422-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ST CHARLES IL
2012-01-18 331-202-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ELMHURST IL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.