网络Subnet Mask疑问

BillyG

如题

Assume an IP of : 192.168.0.1 with Subnet mask of : 255.255.255.20


Is it possible to have a subnet mask of 255.255.255.20 ? （11111111.11111111.11111111.00010100)
or similiar (11111111.11111111.11111111.00001111) (anything below 128)

有没有可能出现 255.255.255.20 的 subnet mask ? (低过 255.255.255.128)
问的是 subnet mask 不是 IP 。

if possible, how will it look like? how's the IP map look like?
how many subnets? how many hosts per subnet? host ranging from which IP to Which IP?

谢谢

vemaxtechnology

我没有看过255.255.255.20的。。会不会是192.168.0.1/20?
也就是192.168.0.1 subnet 255.255.240.0？

dousan

subnet mask 不能放20的

wing_s

255.255.255.20这组subnet是invalid的