Class		Leading bits	End address				Default Subnet Mask
Class A		0				127.255.255.255			255.0.0.0
Class B		10				191.255.255.255			255.255.0.0
Class C		110				223.255.255.255			255.255.255.0
Class D 	(multicast)	1110	239.255.255.255		255.255.255.255

system32>netsh winsock reset
// Successfully reset the Windock reset
// You must restart the computer in order to complete the reset

system32>ipconfig /flushdns
// Successfully flushed the DSN Resolver Cache

system32>ipconfig /renew