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 405

LEVEL 3 COMMUNICATIONS, LLC - OK 22

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
2020-02-20	405-890	0XXX1XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	STELLA	OK
2020-02-18	405-846	1XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	TRIBBEY	OK
2019-02-14	405-597	2XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	BLANCHARD	OK
2019-02-14	405-852	2XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	NEWCASTLE	OK
2019-02-14	405-903	2XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	DIBBLE	OK
2018-06-25	405-894	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	STILLWATER	OK
2017-08-22	405-718	2XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	NEWALLA	OK
2017-08-22	405-988	2XXX3XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	MCLOUD	OK
2016-09-01	405-581	2XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	EARLSBORO	OK
2012-02-22	405-758	0–9 XXXall 10 · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	OKLA CITY	OK
2008-01-03	405-563	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	OKLA CITY	OK
2006-02-09	405-445	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	OKLA CITY	OK
2004-05-04	405-428	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	LINDSAY	OK
2002-05-29	405-592	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	HOLDENVL	OK
2002-05-29	405-716	0–9 XXXall 10 · 8 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	SEMINOLE	OK
2002-05-22	405-648	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	ANADARKO	OK
2002-05-09	405-588	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	CHANDLER	OK
2001-08-17	405-334	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	STILLWATER	OK
2001-07-26	405-308	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	OKLA CITY	OK
—	405-543	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	OKLA CITY	OK
—	405-571	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	STILLWATER	OK
—	405-888	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OK	5257	EDMOND	OK

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.