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 515
T-MOBILE USA, INC. 47
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
2025-12-05 515-403 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
2024-09-10 515-694 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
2024-08-13 515-691 0XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NEVADA IA
2024-07-18 515-796 9XXX which blocks → T-MOBILE USA, INC. 6529 JEFFERSON IA
2023-12-05 515-672 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2022-09-16 515-916 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
2021-09-29 515-567 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
2018-08-15 515-815 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
2018-03-07 515-719 1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TITONKA IA
2018-03-07 515-744 4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 RADCLIFFE IA
2018-03-06 515-385 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CLARION IA
2018-03-06 515-902 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 HUMBOLDT IA
2016-07-15 515-723 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2014-08-26 515-305 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2012-02-24 515-918 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2011-07-22 515-803 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2011-03-22 515-525 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2011-03-02 515-318 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2010-12-08 515-612 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2008-12-15 515-657 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2007-07-24 515-822 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2007-05-23 515-943 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2007-03-13 515-783 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2006-11-01 515-447 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2006-07-28 515-339 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2006-04-26 515-333 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2006-04-04 515-745 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2002-06-24 515-212 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOONE IA
2001-10-30 515-208 5XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2001-08-21 515-302 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 FORT DODGE IA
2001-08-02 515-209 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 WEBSTER CY IA
— 515-202 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-203 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
— 515-372 not yet reported which blocks → T-MOBILE USA, INC. 6529 BOONE IA
— 515-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-441 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
— 515-451 2XXX which blocks → T-MOBILE USA, INC. 6529 AMES IA
— 515-554 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-556 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-770 not yet reported which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-771 not yet reported which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-778 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-779 not yet reported which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-865 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-867 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-988 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-991 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA

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.