The two prominent IP "versions" are IPv4 and IPv6.
An IPv4 address looks like this: 18.104.22.168
IPv6 addresses are usually longer and look like this: 2001:0db8:85a3:0000:0000:8a2e:0370:7334
Due to world IPv4 address exhaustion IPv6 is slowly being deployed. It is a slow and difficult process.
Most people still have IPv4 addresses and will for the forseeable future. If you are wondering whether you have to worry about IPv4 or IPv6, it's probably IPv4 right now.
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