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
2014-09-16 331-702-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 NAPERVILLE IL
2014-09-15 331-422-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2014-09-09 331-254-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SUGARGROVE IL
2014-09-09 331-302-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2014-08-27 331-234-3XXX 3000–3999Assigned ONVOY, LLC 224C SUGARGROVE IL
2014-08-27 331-234-5XXX 5000–5999Assigned ONVOY, LLC 224C SUGARGROVE IL
2014-08-25 331-903-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2014-08-22 331-303-3XXX 3000–3999Assigned ONVOY, LLC 224C ELBURN IL
2014-08-22 331-303-4XXX 4000–4999Assigned ONVOY, LLC 224C ELBURN IL
2014-08-21 331-801-8XXX 8000–8999Assigned ONVOY, LLC 224C DOWNERSGRV IL
2014-08-20 331-302-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J AURORA IL
2014-08-20 331-305-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2014-08-13 331-801-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2014-08-12 331-801-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2014-08-07 331-305-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2014-08-07 331-305-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2014-08-04 331-318-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LEMONT IL
2014-07-31 331-225-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J ELMHURST IL
2014-07-17 331-254-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SUGARGROVE IL
2014-07-17 331-254-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SUGARGROVE IL
2014-07-11 331-234-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SUGARGROVE IL
2014-07-10 331-228-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2014-07-10 331-422-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2014-06-27 331-301-0XXX 0000–0999Assigned METROPCS, INC. 5562 AURORA IL
2014-06-27 331-301-8XXX 8000–8999Assigned METROPCS, INC. 5562 AURORA IL
2014-06-27 331-301-9XXX 9000–9999Assigned METROPCS, INC. 5562 AURORA IL
2014-06-26 331-248-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J GENEVA IL
2014-06-26 331-318-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LEMONT IL
2014-06-18 331-209-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J ELMHURST IL
2014-06-13 331-207-6XXX 6000–6999Assigned ONVOY, LLC 224C YORKVILLE IL
2014-06-13 331-207-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YORKVILLE IL
2014-06-13 331-216-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OSWEGO IL
2014-06-13 331-234-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SUGARGROVE IL
2014-06-13 331-303-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELBURN IL
2014-06-13 331-702-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 NAPERVILLE IL
2014-06-10 331-702-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NAPERVILLE IL
2014-06-10 331-777-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DOWNERSGRV IL
2014-05-19 331-903-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C DOWNERSGRV IL
2014-05-15 331-801-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2014-05-15 331-801-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2014-05-15 331-801-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2014-05-15 331-801-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2014-05-15 331-801-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2014-05-15 331-801-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DOWNERSGRV IL
2014-05-14 331-207-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J YORKVILLE IL
2014-04-23 331-207-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E YORKVILLE IL
2014-04-23 331-207-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E YORKVILLE IL
2014-04-23 331-209-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2014-04-23 331-209-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2014-04-23 331-256-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA 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.