Recent prefix assignments

1 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, 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
2002-06-25	517-588	0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	CHARLOTTE	MI
2002-06-19	517-594	0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	OSSEO	MI
2002-06-18	517-595	0XXX1XXX4XXX5XXX · 3 holders which blocks →	DEERFIELD FARMERS' TELEPHONE COMPANY - MI	558A	WALDRON	MI
2002-06-18	517-597	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	SUNFIELD	MI
2002-06-18	517-691	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	SHAFTSBURG	MI
2002-06-18	517-692	1XXX2XXX7XXX8XXX · 4 holders which blocks →	ACD TELECOM, INC. - MI	3535	SPRINGPORT	MI
2002-06-18	517-695	0XXX1XXX2XXX5XXX6XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	RANSOM	MI
2002-06-18	517-696	0XXX1XXX2XXX6XXX9XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	PRATTVILLE	MI
2002-06-18	517-697	0XXX3XXX5XXX6XXX8XXX · 3 holders which blocks →	DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS	993L	PERRY	MI
2002-06-18	517-698	0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	NORTHADAMS	MI
2002-06-18	517-790	0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	MOSHERVL	MI
2002-06-18	517-792	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	MONTGOMERY	MI
2002-06-18	517-793	0XXX1XXX4XXX5XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	LITCHFIELD	MI
2002-06-18	517-890	0XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	HANOVER	MI
2002-06-18	517-891	0XXX2XXX4XXX5XXX8XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	FRONTIER	MI
2002-06-18	517-895	0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks →	ACD TELECOM, INC. - MI	3535	CONCORD	MI
2002-06-18	517-900	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	ACD TELECOM, INC. - MI	3535	BUNDY HILL	MI
2002-06-18	517-932	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	ACD TELECOM, INC. - MI	3535	ALLEN	MI
2002-06-18	517-938	0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 4 holders which blocks →	ACD TELECOM, INC. - MI	3535	BROOKLYN	MI
2002-06-18	517-946	0XXX2XXX4XXX6XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	CAMBRIA	MI
2002-06-18	517-972	5XXX which blocks →	ACD TELECOM, INC. - MI	3535	BELL OAK	MI
2002-06-18	517-991	0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	ACD TELECOM, INC. - MI	3535	CAMDEN	MI
2002-05-20	517-615	1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	VERMONTVL	MI
2002-05-14	517-803	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	LANSING	MI
2002-05-14	517-826	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	JONESVILLE	MI
2002-05-14	517-879	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	JACKSON	MI
2002-05-09	517-686	0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ONVOY, LLCV - MI	543C	ALBION	MI
2002-04-25	517-612	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	JACKSON	MI
2002-04-22	517-621	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	MUNITH	MI
2002-04-22	517-634	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	FITCHBURG	MI
2002-04-22	517-653	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	BURLINGTON	MI
2002-04-22	517-671	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	TEKONSHA	MI
2002-04-22	517-710	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	STOCKBDG	MI
2002-04-22	517-795	1XXX2XXX which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	JACKSON	MI
2002-04-22	517-872	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	RIVES JCT	MI
2002-03-29	517-667	2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	CHARLOTTE	MI
2002-03-27	517-631	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	WEBBERVL	MI
2002-03-27	517-658	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	READING	MI
2002-03-27	517-716	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	PARMA	MI
2002-03-27	517-724	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	HOMER	MI
2002-03-19	517-721	0XXX7XXX9XXX · 3 holders which blocks →	MICHIGAN BELL TEL CO	9323	LANSING	MI
2002-01-30	517-775	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	LANSING	MI
2002-01-25	517-659	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	ADDISON	MI
2002-01-21	517-906	1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	HOLT	MI
2002-01-21	517-978	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	MASON	MI
2001-12-27	517-652	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	CHARLOTTE	MI
2001-12-27	517-728	1XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	TEKONSHA	MI
2001-12-27	517-736	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	123.NET, LLC	2550	COLDWATER	MI
2001-12-05	517-717	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	WILLIAMSTN	MI
2001-12-05	517-766	not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	ONONDAGA	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.