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
2005-11-21 630-453 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2005-10-17 630-450 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2005-10-06 630-401 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2005-09-01 630-864 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2005-08-22 630-809 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 AURORA IL
2005-07-09 630-386 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2005-05-18 630-270 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2005-04-28 630-901 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2005-04-11 630-812 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2005-03-22 630-903 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2005-03-02 630-765 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHEATON IL
2005-02-28 630-952 0–9 XXXwhole prefix which blocks → FIRST COMMUNICATIONS, LLC 460K AURORA IL
2005-02-16 630-806 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2005-01-12 630-398 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BARTLETT IL
2004-10-13 630-618 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2004-10-11 630-405 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 AURORA IL
2004-09-02 630-303 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2004-08-25 630-995 0–9 XXXall 10 · 8 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2004-08-20 630-201 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2004-07-27 630-991 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2004-07-20 630-701 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2004-05-24 630-967 0–9 XXXall 10 · 2 holders which blocks → FIRST COMMUNICATIONS, LLC 460K DOWNERSGRV IL
2004-05-21 630-957 0–9 XXXall 10 · 4 holders which blocks → FIRST COMMUNICATIONS, LLC 460K W CHICAGO IL
2004-04-27 630-849 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2004-01-26 630-687 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2004-01-21 630-392 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2003-07-14 630-885 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2003-01-31 630-956 0–9 XXXall 10 · 2 holders which blocks → ILLINOIS BELL TEL CO 9329 ELMHURST IL
2003-01-22 630-883 0XXX1XXX3XXX4XXX5XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELGIN IL
2002-12-10 630-813 none assigned yet which blocks → ILLINOIS BELL TEL CO 9329 NAPERVILLE IL
2002-10-03 630-768 none assigned yet which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2002-08-30 630-699 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2002-06-17 630-546 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2002-06-10 630-664 none assigned yet which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2002-06-10 630-709 none assigned yet which blocks → METROPCS, INC. 5562 ROSELLE IL
2002-05-20 630-862 0–9 XXXall 10 · 3 holders which blocks → ILLINOIS BELL TEL CO 9329 AURORA IL
2002-02-28 630-730 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2002-02-11 630-362 not yet reported which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2002-01-22 630-715 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2002-01-17 630-803 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2001-09-06 630-915 not yet reported which blocks → T-MOBILE USA, INC. 6529 HINSDALE IL
2001-08-06 630-853 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2001-07-27 630-805 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LA GRANGE IL
2001-07-06 630-881 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2001-06-06 630-788 not yet reported which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2001-06-06 630-890 not yet reported which blocks → T-MOBILE USA, INC. 6529 WHEATON IL
2001-04-23 630-265 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LA GRANGE IL
2001-04-23 630-298 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LA GRANGE IL
2001-04-23 630-316 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LA GRANGE IL
2001-04-19 630-878 not yet reported which blocks → T-MOBILE USA, INC. 6529 LA GRANGE 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.