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 951
METROPCS NETWORKS, LLC 24
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
2023-10-09 951-670 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D ELSINORE CA
2023-10-09 951-673 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D HEMT SNJC CA
2023-06-21 951-635 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS NETWORKS, LLC 899D MURRIETA CA
2019-03-15 951-498 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D ELSINORE CA
2018-05-09 951-451 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D HEMT SNJC CA
2018-04-16 951-450 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D PERRIS CA
2018-03-22 951-822 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D PERRIS CA
2015-01-09 951-422 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D PERRIS CA
2014-09-22 951-425 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2009-09-03 951-286 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2009-07-06 951-269 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D MORENO CA
2008-12-11 951-261 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2008-05-13 951-732 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2007-09-27 951-241 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2007-09-24 951-239 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D MURRIETA CA
2007-07-13 951-250 0–9 XXXwhole prefix which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2007-03-20 951-224 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2007-03-19 951-220 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D CORONA CA
2007-02-24 951-219 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D MURRIETA CA
2001-07-17 951-634 none assigned yet which blocks → METROPCS NETWORKS, LLC 899D HEMT HEMT CA
— 951-232 none assigned yet which blocks → METROPCS NETWORKS, LLC 899D RIVERSIDE CA
— 951-254 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D CORONA CA
— 951-707 3XXX5XXX6XXX7XXX8XXX9XXX which blocks → METROPCS NETWORKS, LLC 899D CORONA CA
— 951-963 0XXX1XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → METROPCS NETWORKS, LLC 899D CORONA CA

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.