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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-01-21 331-716-1XXX 1000–1999Assigned ONVOY, LLC 224C WHEATON IL
2016-01-21 331-716-2XXX 2000–2999Assigned ONVOY, LLC 224C WHEATON IL
2016-01-21 331-716-3XXX 3000–3999Assigned ONVOY, LLC 224C WHEATON IL
2016-01-21 331-717-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
2016-01-15 331-307-1XXX 1000–1999Assigned ONVOY, LLC 224C LOMBARD IL
2016-01-15 331-307-2XXX 2000–2999Assigned ONVOY, LLC 224C LOMBARD IL
2016-01-15 331-401-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NAPERVILLE IL
2016-01-14 331-979-3XXX 3000–3999Assigned ONVOY, LLC 224C ELMHURST IL
2016-01-14 331-979-4XXX 4000–4999Assigned ONVOY, LLC 224C ELMHURST IL
2016-01-14 331-979-5XXX 5000–5999Assigned ONVOY, LLC 224C ELMHURST IL
2016-01-14 331-998-6XXX 6000–6999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2016-01-14 331-998-7XXX 7000–7999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2016-01-14 331-998-9XXX 9000–9999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2016-01-11 331-321-4XXX 4000–4999Assigned ONVOY, LLC 224C AURORA IL
2016-01-11 331-321-7XXX 7000–7999Assigned ONVOY, LLC 224C AURORA IL
2016-01-11 331-321-8XXX 8000–8999Assigned ONVOY, LLC 224C AURORA IL
2016-01-11 331-703-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2016-01-11 331-703-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2016-01-07 331-998-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2016-01-06 331-775-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DOWNERSGRV IL
2015-12-29 331-401-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2015-12-15 331-401-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NAPERVILLE IL
2015-12-11 331-204-0XXX 0000–0999Assigned ONVOY, LLC 224C NAPERVILLE IL
2015-12-11 331-204-1XXX 1000–1999Assigned ONVOY, LLC 224C NAPERVILLE IL
2015-11-25 331-253-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2015-11-12 331-979-9XXX 9000–9999Assigned ONVOY, LLC 224C ELMHURST IL
2015-11-03 331-814-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J NAPERVILLE IL
2015-10-30 331-998-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 DOWNERSGRV IL
2015-10-26 331-998-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2015-10-14 331-814-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2015-10-14 331-901-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2015-09-30 331-253-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 LEMONT IL
2015-09-30 331-901-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ST CHARLES IL
2015-09-25 331-998-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DOWNERSGRV IL
2015-09-17 331-998-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2015-09-17 331-998-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2015-09-14 331-814-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J NAPERVILLE IL
2015-09-11 331-302-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2015-09-11 331-454-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2015-09-09 331-321-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 AURORA IL
2015-09-02 331-444-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2015-08-27 331-703-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2015-08-27 331-703-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2015-08-27 331-903-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2015-08-20 331-254-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SUGARGROVE IL
2015-08-10 331-806-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WHEATON IL
2015-08-10 331-806-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 WHEATON IL
2015-08-10 331-806-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WHEATON IL
2015-08-10 331-901-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2015-08-10 331-901-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES 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.