IP subnet calculator

213.8.57.0-213.8.65.255

213.8.57.0-213.8.57.255
213.8.57.0/24

213.8.58.0-213.8.59.255
213.8.58.0/23

213.8.60.0-213.8.63.255
213.8.60.0/22

213.8.64.0-213.8.65.255
213.8.64.0/23