Калькулятор IP подсетей

81.0.230.0-81.0.243.255

81.0.230.0-81.0.231.255
81.0.230.0/23

81.0.232.0-81.0.239.255
81.0.232.0/21

81.0.240.0-81.0.243.255
81.0.240.0/22