CIDR (Classless Inter-Domain Routing) notation can be used to represent a range of IP addresses. It has two parts:
- prefix - Network address (a normal IP address)
- suffix - number of bits of the network address provided in the prefix
An example cidr block looks like this: 192.0.2.0/24
Since ipv4 network address has 32 bits, specifying an address with the suffix 32 (e.g. 189.120.95.72/32) will describe that exact ip address - 189.120.95.72
With prefix 24 (189.120.95.72/24), first 24 bits of the address are kept static, while the last 8 bits show the actual range of addresses represented by this CIDR block. In other words, this will represent all the addresses from 189.120.95.0 to 189.120.95.255.
Similarily with prefix 16 (189.120.95.72/24), half of the address is taken as-is, while the other half represents the range (189.120.0.0 to 189.120.255.255)
Following the same pattern, suffix /0 will always mean any ip address regardless of the network address provided, so it's usually written like 0.0.0.0/0
Status: #🌲