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 517

ACD TELECOM, INC. - MI 56

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
2002-07-22	517-684	0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	ACD TELECOM, INC. - MI	3535	NAPOLEON	MI
2002-06-19	517-594	0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	OSSEO	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	517-698	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
2002-01-21	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
2001-11-15	517-903	1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	BATH	MI
2001-11-15	517-907	5XXX6XXX8XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	CLARKLAKE	MI
2001-11-15	517-909	0XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	DANSVILLE	MI
2001-11-15	517-912	1XXX2XXX3XXX5XXX6XXX8XXX which blocks →	ACD TELECOM, INC. - MI	3535	DIMONDALE	MI
2001-11-15	517-922	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	EATON RPD	MI
2001-11-15	517-923	2XXX3XXX which blocks →	ACD TELECOM, INC. - MI	3535	FITCHBURG	MI
2001-11-15	517-925	1XXX5XXX6XXX8XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	GRANDLEDGE	MI
2001-11-15	517-926	0XXX1XXX6XXX8XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	GRASS LAKE	MI
2001-11-15	517-929	0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	HOMER	MI
2001-11-15	517-941	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	LAINGSBURG	MI
2001-11-15	517-942	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	LESLIE	MI
2001-11-15	517-948	0XXX5XXX6XXX8XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	MULLIKEN	MI
2001-11-15	517-953	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	MUNITH	MI
2001-11-15	517-963	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	PARMA	MI
2001-11-15	517-965	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	POTTERVL	MI
2001-11-15	517-970	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	READING	MI
2001-11-15	517-979	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	RIVES JCT	MI
2001-11-15	517-981	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	VERMONTVL	MI
2001-11-15	517-984	0XXX1XXX5XXX6XXX8XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	WEBBERVL	MI
2001-11-15	517-996	0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	WILLIAMSTN	MI
2001-10-30	517-915	0XXX1XXX5XXX6XXX8XXX · 4 holders which blocks →	ACD TELECOM, INC. - MI	3535	FOWLERVL	MI
2001-10-30	517-921	0XXX1XXX5XXX6XXX8XXX · 4 holders which blocks →	ACD TELECOM, INC. - MI	3535	ADDISON	MI
2001-10-30	517-964	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	HILLSDALE	MI
2001-10-01	517-995	1XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	ACD TELECOM, INC. - MI	3535	JONESVILLE	MI
2001-05-02	517-985	0XXX1XXX5XXX6XXX8XXX · 4 holders which blocks →	ACD TELECOM, INC. - MI	3535	STOCKBDG	MI
2001-03-26	517-949	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	DE WITT	MI
2001-02-28	517-961	not yet reported which blocks →	ACD TELECOM, INC. - MI	3535	ALBION	MI
—	517-760	0XXX1XXX5XXX6XXX8XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	NASHVILLE	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.