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 937
T-MOBILE USA, INC. 64
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
2024-02-20 937-326 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MSBGWCRLTN OH
2024-02-20 937-983 0XXX1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TIPP CITY OH
2023-08-04 937-946 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 XENIA OH
2022-01-28 937-861 0XXX1XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
2022-01-19 937-820 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 HILLSBORO OH
2021-03-19 937-794 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PIQUA OH
2017-06-01 937-300 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
2016-05-25 937-991 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2015-10-23 937-993 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2015-07-21 937-951 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2014-08-22 937-931 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2014-03-03 937-815 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2013-03-11 937-818 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2012-03-19 937-607 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2011-11-16 937-516 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2011-10-07 937-503 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2006-10-13 937-717 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
2005-06-29 937-733 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
2004-11-04 937-670 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE OH
2001-10-04 937-414 1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2001-08-29 937-508 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 URBANA OH
2001-08-23 937-876 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GREENFIELD OH
2001-03-26 937-302 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WILMINGTON OH
2001-02-28 937-380 8XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2001-02-06 937-790 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 FRANKLIN OH
— 937-219 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-241 0XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-251 9XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-304 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-305 2XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-313 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-321 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-360 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
— 937-361 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-367 0XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-369 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-389 0XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-422 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-459 1XXX3XXX4XXX5XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE OH
— 937-467 0XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE OH
— 937-469 7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-483 1XXX2XXX3XXX4XXX5XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN OH
— 937-524 0XXX2XXX5XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TROY OH
— 937-527 0XXX2XXX4XXX5XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WILMINGTON OH
— 937-532 0XXX1XXX2XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 XENIA OH
— 937-533 2XXX3XXX4XXX5XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
— 937-536 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
— 937-541 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PIQUA OH
— 937-543 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 NEWCARLISL OH
— 937-554 not yet reported which blocks → T-MOBILE USA, INC. 6529 DAYTON OH

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.