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#ipv4
2 posts
October 22, 2026
Subnet mask and CIDR explained, with a cheat sheet
What a subnet mask actually does, how /24 and 255.255.255.0 are the same thing, how to find the network, broadcast and usable hosts by hand, and a CIDR cheat sheet from /8 to /32.
October 22, 2026
子网掩码和 CIDR 怎么算？/24 是什么意思（附速查表）
子网掩码到底在做什么、/24 和 255.255.255.0 为什么是同一回事、怎样手算网络地址、广播地址和可用主机数，以及 /8 到 /32 的 CIDR 速查表。