NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
T-MOBILE USA, INC. 76
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
2024-07-24 630-763 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2011-03-31 630-731 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2010-08-12 630-538 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SUGARGROVE IL
2010-06-24 630-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2007-05-22 630-666 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2006-10-13 630-888 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2006-10-03 630-808 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2006-07-13 630-340 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2006-06-21 630-999 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SUGARGROVE 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
2005-04-28 630-901 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2005-03-22 630-903 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2005-02-16 630-806 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2004-10-13 630-618 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2004-08-20 630-201 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2004-07-20 630-701 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2004-04-27 630-849 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AURORA 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
2002-10-03 630-768 none assigned yet which blocks → T-MOBILE USA, INC. 6529 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
2002-02-11 630-362 not yet reported which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE 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
2001-06-06 630-788 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
2001-04-19 630-878 not yet reported which blocks → T-MOBILE USA, INC. 6529 LA GRANGE IL
2001-04-19 630-973 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ROSELLE IL
2001-04-09 630-863 7XXX which blocks → T-MOBILE USA, INC. 6529 LEMONT IL
2001-04-02 630-290 not yet reported which blocks → T-MOBILE USA, INC. 6529 LOMBARD IL
2001-04-02 630-802 not yet reported which blocks → T-MOBILE USA, INC. 6529 SUGARGROVE IL
2001-04-02 630-935 not yet reported which blocks → T-MOBILE USA, INC. 6529 LOMBARD IL
2001-02-14 630-688 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2001-02-12 630-440 3XXX which blocks → T-MOBILE USA, INC. 6529 W CHICAGO IL
2001-01-25 630-400 not yet reported which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2001-01-25 630-854 not yet reported which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
2001-01-03 630-776 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
— 630-202 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA GRANGE IL
— 630-205 none assigned yet which blocks → T-MOBILE USA, INC. 6529 NORTHBROOK IL
— 630-327 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA GRANGE IL
— 630-330 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
— 630-333 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
— 630-335 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 NAPERVILLE IL
— 630-361 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ITASCA IL
— 630-417 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA GRANGE IL
— 630-430 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA GRANGE IL
— 630-452 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA GRANGE IL
— 630-461 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ROSELLE IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.