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 779
T-MOBILE USA, INC. 25
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
2026-04-28 779-780 9XXX which blocks → T-MOBILE USA, INC. 6529 LOCKPORT IL
2025-11-25 779-436 0XXX1XXX2XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLAINFIELD IL
2025-08-19 779-431 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DE KALB IL
2024-06-25 779-403 0XXX1XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MCHENRY IL
2024-03-27 779-390 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LOCKPORT IL
2024-02-08 779-386 0XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRINCETON IL
2024-01-09 779-384 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 HARVARD IL
2023-07-20 779-372 0XXX1XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 DIXON IL
2022-01-11 779-349 3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SPRING VLY IL
2021-06-10 779-329 0XXX2XXX3XXX5XXX6XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MENDOTA IL
2018-02-27 779-250 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 STERLING IL
2017-06-01 779-241 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MORRIS IL
2017-04-04 779-238 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROCKFORD IL
2016-11-16 779-915 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 WOODSTOCK IL
2015-05-22 779-713 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODSTOCK IL
2014-06-11 779-240 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 KANKAKEE IL
2014-06-11 779-301 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 KANKAKEE IL
2014-06-11 779-702 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 JOLIET IL
2013-10-07 779-703 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 JOLIET IL
2011-07-27 779-236 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 KANKAKEE IL
2011-07-21 779-233 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 JOLIET IL
2011-02-17 779-300 0XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKFORD IL
2008-07-14 779-245 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 STERLING IL
2008-01-09 779-456 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 JOLIET IL
2007-07-12 779-875 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 JOLIET 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.