diff --git a/Windows API/IsDomainController.cpp b/Windows API/IsDomainController.cpp
new file mode 100644
index 0000000..4cdd16d
--- /dev/null
+++ b/Windows API/IsDomainController.cpp	
@@ -0,0 +1,67 @@
+DWORD IsDomainController(PBOOL IsDomainController)
+{
+	typedef enum _DSROLE_PRIMARY_DOMAIN_INFO_LEVEL {
+		DsRolePrimaryDomainInfoBasic = 1,
+		DsRoleUpgradeStatus,
+		DsRoleOperationState
+	} DSROLE_PRIMARY_DOMAIN_INFO_LEVEL;
+
+	typedef enum _DSROLE_MACHINE_ROLE {
+		DsRole_RoleStandaloneWorkstation,
+		DsRole_RoleMemberWorkstation,
+		DsRole_RoleStandaloneServer,
+		DsRole_RoleMemberServer,
+		DsRole_RoleBackupDomainController,
+		DsRole_RolePrimaryDomainController
+	} DSROLE_MACHINE_ROLE;
+
+	typedef struct _DSROLE_PRIMARY_DOMAIN_INFO_BASIC {
+		DSROLE_MACHINE_ROLE MachineRole;
+		ULONG               Flags;
+		LPWSTR              DomainNameFlat;
+		LPWSTR              DomainNameDns;
+		LPWSTR              DomainForestName;
+		GUID                DomainGuid;
+	} DSROLE_PRIMARY_DOMAIN_INFO_BASIC, * PDSROLE_PRIMARY_DOMAIN_INFO_BASIC;
+
+	typedef DWORD(WINAPI* DSROLEGETPRIMARYDOMAININFORMATION)(LPCWSTR, DSROLE_PRIMARY_DOMAIN_INFO_LEVEL, PDSROLE_PRIMARY_DOMAIN_INFO_BASIC);
+	typedef VOID(WINAPI* DSROLEFREEMEMORY)(PVOID);
+
+	HMODULE hLibrary = NULL;
+	DSROLEGETPRIMARYDOMAININFORMATION DsRoleGetPrimaryDomainInformation = NULL;
+	DSROLEFREEMEMORY DsRoleFreeMemory = NULL;
+	PDSROLE_PRIMARY_DOMAIN_INFO_BASIC Buffer = 0;
+	DWORD dwError = ERROR_SUCCESS;
+	*IsDomainController = FALSE;
+
+	hLibrary = LoadLibraryW(L"Netapi32.dll");
+	if (hLibrary == NULL)
+		goto EXIT_ROUTINE;
+
+	DsRoleGetPrimaryDomainInformation = (DSROLEGETPRIMARYDOMAININFORMATION)GetProcAddress(hLibrary, "DsRoleGetPrimaryDomainInformation");
+	DsRoleFreeMemory = (DSROLEFREEMEMORY)GetProcAddress(hLibrary, "DsRoleFreeMemory");
+
+	if (!DsRoleGetPrimaryDomainInformation || !DsRoleFreeMemory)
+		goto EXIT_ROUTINE;
+
+	if (DsRoleGetPrimaryDomainInformation(0, DsRolePrimaryDomainInfoBasic, Buffer) != ERROR_SUCCESS)
+		goto EXIT_ROUTINE;
+
+	if (Buffer != NULL)
+	{
+		if (Buffer->MachineRole == DsRole_RolePrimaryDomainController)
+			*IsDomainController = TRUE;
+	}
+		
+EXIT_ROUTINE:
+
+	dwError = EhGetLastError();
+
+	if (hLibrary)
+		FreeLibrary(hLibrary);
+
+	if (Buffer)
+		DsRoleFreeMemory(&Buffer);
+
+	return dwError;
+}