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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2009-12-17 331-332-1XXX 1000–1999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-17 331-332-9XXX 9000–9999Assigned ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2009-12-09 331-422-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2009-11-10 331-454-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2009-10-29 331-442-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J ST CHARLES IL
2009-10-29 331-454-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2009-10-29 331-725-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J OSWEGO IL
2009-10-27 331-465-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J W CHICAGO IL
2009-10-21 331-330-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NAPERVILLE IL
2009-10-21 331-457-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J NAPERVILLE IL
2009-10-21 331-826-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J ELMHURST IL
2009-10-20 331-625-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2009-10-09 331-454-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2009-10-08 331-454-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J AURORA IL
2009-09-28 331-643-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2009-09-28 331-684-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2009-09-16 331-725-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J OSWEGO IL
2009-08-20 331-442-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2009-08-20 331-442-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2009-08-20 331-481-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2009-08-11 331-684-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 AURORA IL
2009-08-04 331-452-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2009-07-20 331-333-5XXX 5000–5999Assigned ONVOY, LLC 224C NAPERVILLE IL
2009-07-16 331-333-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 NAPERVILLE IL
2009-07-14 331-472-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J NAPERVILLE IL
2009-06-18 331-481-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DOWNERSGRV IL
2009-06-18 331-826-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELMHURST IL
2009-06-15 331-262-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2009-06-15 331-262-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2009-06-15 331-725-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
2009-06-04 331-481-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DOWNERSGRV IL
2009-05-11 331-454-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-05-11 331-454-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-05-05 331-262-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-05-05 331-262-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-05-05 331-262-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-05-05 331-262-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-05-05 331-262-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2009-04-20 331-481-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2009-04-15 331-442-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2009-03-12 331-465-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 W CHICAGO IL
2009-02-06 331-643-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2009-01-26 331-481-4XXX 4000–4999Assigned ACCESS ONE, INC. - IL 5447 DOWNERSGRV 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.