Glossary term
What is netmask? Meaning for developers
The prefix length written as an address, so /26 is 255.255.255.192.
Learn it properly · Networking for DevelopersLesson 1: IP Addresses, Subnets, NAT and RoutingIPv4 and IPv6, CIDR notation worked by hand, private ranges, NAT, routing tables and how a packet finds its way.