NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 630
ILLINOIS BELL TEL CO 258
NEW CINGULAR WIRELESS PCS, LLC - IL 103
T-MOBILE USA, INC. 76
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 75
TELEPORT COMMUNICATIONS AMERICA, LLC - IL 57
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-07-21 630-695 6XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2025-05-12 630-996 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2024-07-24 630-763 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2023-10-10 630-895 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2023-06-26 630-331 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C ELMHURST IL
2021-01-25 630-720 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2019-10-10 630-349 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D ELMHURST IL
2015-01-15 630-381 0–9 XXXall 10 · 3 holders which blocks → ILLINOIS BELL TEL CO 9329 YORKVILLE IL
2012-11-05 630-394 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E KANEVILLE IL
2011-03-31 630-731 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2011-03-01 630-491 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ELMHURST IL
2010-10-06 630-796 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E DOWNERSGRV IL
2010-09-02 630-360 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SUGARGROVE IL
2010-08-12 630-538 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SUGARGROVE IL
2010-07-21 630-465 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2010-06-28 630-537 0–9 XXXall 10 · 6 holders which blocks → ILLINOIS BELL TEL CO 9329 HINSDALE IL
2010-06-24 630-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2010-06-18 630-486 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C AURORA IL
2009-11-20 630-473 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J W CHICAGO IL
2009-11-03 630-332 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J PLANO IL
2009-10-16 630-277 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SUGARGROVE IL
2009-09-30 630-256 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 AURORA IL
2008-08-21 630-780 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2008-06-25 630-869 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E DOWNERSGRV IL
2008-06-12 630-432 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2008-06-11 630-746 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SUGARGROVE IL
2008-02-07 630-352 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2008-02-07 630-488 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ST CHARLES IL
2007-12-18 630-487 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2007-06-27 630-630 0–9 XXXwhole prefix which blocks → FIRST COMMUNICATIONS, LLC 460K OSWEGO IL
2007-05-22 630-666 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2007-03-14 630-815 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2007-03-14 630-847 0XXX1XXX4XXX7XXX · 2 holders which blocks → ONVOY, LLC 224C LOMBARD IL
2007-02-15 630-312 0–9 XXXall 10 · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 LEMONT IL
2006-11-16 630-219 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NAPERVILLE IL
2006-11-15 630-708 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C YORKVILLE IL
2006-10-16 630-800 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2006-10-13 630-888 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2006-10-13 630-962 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 AURORA IL
2006-10-12 630-877 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2006-10-03 630-808 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2006-08-30 630-200 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2006-08-23 630-777 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SUGARGROVE IL
2006-07-13 630-340 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2006-07-13 630-770 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 AURORA IL
2006-06-21 630-999 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SUGARGROVE IL
2006-06-20 630-914 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → ILLINOIS BELL TEL CO 9329 LEMONT IL
2006-05-02 630-414 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2006-04-27 630-470 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2006-04-13 630-447 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WARRENVL IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.