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 414
T-MOBILE USA, INC. 54
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2023-08-28 414-262 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2022-08-29 414-381 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2022-01-20 414-317 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-08-13 414-275 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-08-13 414-509 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-06-09 414-808 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-05-22 414-206 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2015-05-21 414-928 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2015-05-14 414-629 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-02-05 414-210 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2014-03-17 414-439 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2013-10-08 414-797 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2013-09-20 414-249 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2013-04-25 414-595 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2013-04-25 414-865 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2011-07-27 414-394 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-06-21 414-391 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-06-09 414-388 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-06-03 414-639 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-03-18 414-914 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-02-25 414-366 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-233 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-484 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-499 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-739 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2010-10-25 414-949 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2004-03-01 414-446 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2003-02-24 414-334 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN5 WI
2003-01-22 414-243 5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2002-04-02 414-234 2XXX3XXX4XXX5XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN5 WI
2002-04-02 414-235 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN3 WI
2002-04-02 414-236 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2002-01-16 414-736 7XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2002-01-16 414-737 7XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN5 WI
— 414-213 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-241 not yet reported which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN5 WI
— 414-324 not yet reported which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-349 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-350 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-364 not yet reported which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
— 414-397 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-406 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-460 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-467 0XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-628 not yet reported which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN3 WI
— 414-732 2XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-745 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-788 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-803 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-807 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI

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.