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 307

LEVEL 3 COMMUNICATIONS, LLC - WY 27

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
2023-05-24	307-416	0XXX1XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	PINEDALE	WY
2019-07-22	307-323	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	PINEDALE	WY
2019-07-22	307-336	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	DANIEL	WY
2019-07-22	307-456	0–9 XXXall 10 · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	BIG PINEY	WY
2016-11-16	307-205	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	LINGLE	WY
2015-10-08	307-447	2XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	SARATOGA	WY
2006-06-21	307-392	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	BORDER	WY
2004-05-26	307-271	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	POWELL	WY
2004-05-19	307-257	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	GILLETTE	WY
2004-05-19	307-278	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	BUFFALO	WY
2004-05-19	307-288	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	EVANSTON	WY
2004-05-19	307-298	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	DOUGLAS	WY
2003-01-07	307-201	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	JACKSON	WY
2002-08-16	307-200	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	JACKSON	WY
2002-07-16	307-212	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	ROCK SPG	WY
2002-07-16	307-213	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CODY	WY
2002-06-11	307-459	0XXX1XXX2XXX3XXX5XXX6XXX8XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CHEYENNE	WY
2002-06-11	307-460	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	LARAMIE	WY
2002-06-11	307-461	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	SHERIDAN	WY
2002-06-11	307-462	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CASPER	WY
2002-06-11	307-463	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	RIVERTON	WY
—	307-222	2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CHEYENNE	WY
—	307-223	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	LARAMIE	WY
—	307-224	2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CASPER	WY
—	307-269	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	WHEATLAND	WY
—	307-313	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	EVANSTON	WY
—	307-439	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CASPER	WY

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.