IRC-Documentation/doc/initial.md

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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:

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