What Is /20 Subnet Mask?
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A /20 subnet mask is a Class C network mask that allows for up to 4,094 hosts and has a 255.255.240.0 format. It consists of a 20–bit network prefix and a 12–bit host ID.
A /20 subnet mask is a Class C network mask that uses 20 bits of the 32-bit IP address for the subnet. It allows for up to 4094 usable IP addresses in the subnet. This subnet mask is typically used in larger organizations and networks.