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 231

CHARTER IP ENABLED SERVICES, LLC 20

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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2025-03-12	231-214	1XXX which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	LAKE NORTH	MI
2024-03-01	231-453	1XXX which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	HOLTON	MI
2022-12-05	231-415	1XXX which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	DUBLIN	MI
2021-05-13	231-296	0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	FREMONT	MI
2021-05-13	231-298	0XXX2XXX4XXX7XXX8XXX9XXX · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	IRONS	MI
2021-05-13	231-381	0XXX1XXX3XXX7XXX · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	WHITECLOUD	MI
2021-05-13	231-449	0XXX1XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	BALDWIN	MI
2019-04-19	231-763	0XXX8XXX · 2 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	AMBLE	MI
2017-04-20	231-581	none assigned yet which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	ALBA	MI
2016-09-23	231-545	0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	BOYNEFALLS	MI
2015-12-07	231-234	1XXX which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	BUCKLEY	MI
2014-09-25	231-685	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	RAVENNA	MI
2014-05-19	231-265	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CORAL	MI
2012-09-26	231-227	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	HONOR	MI
2012-09-26	231-295	7XXX which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	LAKE CITY	MI
2012-09-26	231-359	0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	MECOSTA	MI
2012-09-26	231-626	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	LEVERING	MI
2010-07-30	231-292	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	WHITEHALL	MI
2007-02-07	231-259	0–9 XXXall 10 · 8 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	SHELBY	MI
2002-02-20	231-421	0–9 XXXall 10 · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	TRAVERSECY	MI

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.