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 309
T-MOBILE USA, INC. 34
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
2025-01-07 309-969 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MOLINE IL
2019-01-04 309-520 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2019-01-04 309-553 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2018-10-04 309-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2018-06-12 309-350 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2016-05-09 309-954 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MACOMB IL
2010-10-20 309-340 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
2008-09-08 309-428 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2008-09-04 309-847 not yet reported which blocks → T-MOBILE USA, INC. 6529 KEWANEE IL
2003-11-10 309-336 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
2003-10-21 309-489 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GENESEO IL
2003-07-30 309-540 0XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 KEWANEE IL
2003-01-16 309-502 0XXX1XXX2XXX3XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GENESEO IL
2003-01-02 309-501 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WASHINGTON IL
2002-06-10 309-750 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
2002-06-10 309-868 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
2002-04-17 309-613 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PEKIN IL
2002-02-25 309-303 9XXX which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
2001-08-17 309-922 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
2001-03-16 309-721 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2001-01-12 309-648 0XXX which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-208 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-242 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-261 5XXX which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-262 1XXX2XXX3XXX4XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-269 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
— 309-275 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-292 not yet reported which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
— 309-299 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 GALESBURG IL
— 309-314 9XXX which blocks → T-MOBILE USA, INC. 6529 MOLINE IL
— 309-453 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-472 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-631 not yet reported which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
— 309-989 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PEORIA 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.