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 618
T-MOBILE USA, INC. 40
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
2023-08-11 618-986 7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WATERLOO IL
2023-08-10 618-981 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2023-07-28 618-573 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
2021-10-29 618-809 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON IL
2021-06-02 618-725 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 VANDALIA IL
2021-06-02 618-737 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
2017-06-01 618-217 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOOD RIVER IL
2016-05-05 618-517 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OLNEY IL
2015-02-09 618-419 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2013-09-20 618-802 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2010-07-30 618-504 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WATERLOO IL
2009-05-05 618-823 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2008-11-26 618-434 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CARBONDALE IL
2005-02-18 618-447 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
2002-10-30 618-410 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
2002-02-04 618-579 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARION IL
2001-05-30 618-709 0XXX1XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2001-05-30 618-917 2XXX3XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WOOD RIVER IL
2001-05-03 618-698 2XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
2001-05-03 618-719 0XXX2XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 COLUMBIA IL
2001-01-04 618-741 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-203 5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CARBONDALE IL
— 618-204 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON IL
— 618-316 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON IL
— 618-477 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-514 7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-530 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-531 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-558 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-567 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-580 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-581 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-593 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-670 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-671 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
— 618-696 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-779 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-781 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-789 8XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-960 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL 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.