Initial connection

When a client connect to a server, the server might output:

↙️ :server NOTICE * :Checking Ident
↙️ :server NOTICE * :Looking up your hostname...
↙️ :server NOTICE * :Couldn't find your hostname
↙️ :server NOTICE * :No Ident response

What the server does is:

Check the client's hostname (domain) via an rDNS lookup of the IP address.
Try to connect to the client's Ident server (if it has one)

And then most clients will send:

↗️ NICK nick
↗️ USER nick 0 * :realname
↗️ CAP LS 302

Set their nickname, server can show an error before connecting so the client can change the nickname before the connection is established.
Set their username, modes (mostly unused by the IRCd), and real name

Caution

Since the realname can have spaces in it, it must be prefixed with a colon.
For more info on colon prefixes, see Colon Prefixing

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Initial connection

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