Recent prefix assignments

1 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, last 30 days — NPA 517

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 1

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
—	517-726	2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	MICHIGAN BELL TEL CO	9323	VERMONTVL	MI
—	517-734	not yet reported which blocks →				MI
—	517-740	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	JACKSON	MI
—	517-741	0XXX6XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - MI	0695	UNION CITY	MI
—	517-745	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	JACKSON	MI
—	517-748	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks →	AT&T ENTERPRISES, LLC	516C	JACKSON	MI
—	517-749	none assigned yet which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	LANSING	MI
—	517-750	7XXX8XXX which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-760	0XXX1XXX5XXX6XXX8XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	NASHVILLE	MI
—	517-763	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MICHIGAN BELL TEL CO	9323	LANSING	MI
—	517-764	8XXX which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-765	0XXX1XXX6XXX8XXX · 3 holders which blocks →	FRONTIER MIDSTATES, INC. - MI	0681	BURLINGTON	MI
—	517-767	8XXX9XXX · 2 holders which blocks →	FRONTIER MIDSTATES, INC. - MI	0681	TEKONSHA	MI
—	517-768	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-769	0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-780	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-782	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-783	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-784	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-787	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-788	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-789	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-794	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	LANSING	MI
—	517-796	3XXX which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-804	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	FOWLERVL	MI
—	517-809	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	TECUMSEH	MI
—	517-810	not yet reported which blocks →				MI
—	517-811	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MI
—	517-812	none assigned yet which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	JACKSON	MI
—	517-813	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	BLISSFIELD	MI
—	517-815	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - MI	0695	TECUMSEH	MI
—	517-816	4XXX6XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	LANSING	MI
—	517-817	5XXX6XXX8XXX9XXX · 2 holders which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-819	none assigned yet which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	LANSING	MI
—	517-825	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	HILLSDALE	MI
—	517-827	not yet reported which blocks →	PAETEC ITEL, LLC	829J	LANSING	MI
—	517-840	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-841	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	JACKSON	MI
—	517-849	3XXX which blocks →	MICHIGAN BELL TEL CO	9323	JONESVILLE	MI
—	517-851	1XXX2XXX3XXX · 3 holders which blocks →	FRONTIER MIDSTATES, INC. - MI	0681	STOCKBDG	MI
—	517-852	3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks →	MICHIGAN BELL TEL CO	9323	NASHVILLE	MI
—	517-853	2XXX4XXX5XXX7XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	LANSING	MI
—	517-857	not yet reported which blocks →	SPRINGPORT TEL. CO.	0728	SPRINGPORT	MI
—	517-868	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	DIMONDALE	MI
—	517-869	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF MICHIGAN, INC.	4417	ALLEN	MI
—	517-880	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	XXXXXXXXXX	MI
—	517-881	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	LANSING	MI
—	517-882	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LANSING	MI
—	517-884	not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LANSING	MI
—	517-885	0XXX1XXX2XXX3XXX5XXX8XXX · 3 holders which blocks →	MICHIGAN BELL TEL CO	9323	LANSING	MI

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.