Nothing is revealed.
Apple has unique system for connecting to the airport.. so as to avoid using HTML pages.
The Airports contain a command interpreter.
The protocol may be called ACP.
see https://tools.ietf.org/html/draft-kaaps-acp-01
But it is very proprietary and no info leaks out of apple on such things.
Inside that is a huge amount of information. I can link you to it.. but it is not easy.
First of all learn about the natutil
Terminal command to check Apple router status. natutil
That actually gives a lot of insight into what is happening.
Apple do not actually open port 23 for telnet.. it is opened on port 5001
Port Scan has started…
Port Scanning host: 192.168.2.201
Open TCP Port: 5001 commplex-link
Open TCP Port: 5009 winfs
Port Scan has completed…
Do the port scan yourself.. just use the network utility.
Then you can explore deeper by soldering in a console port.
http://embeddedideation.com/2014/03/dissecting-the-airport-express/
And when you do that you will come face to face with the dragon.
aegen5router# acp
acp [-q] <code>[=<value>] ...
acp acpprop [match] -- Search or list an ACP property by code or name
acp corrupt_hfs
acp crash [align]
acp error [match] -- Search or list an error code by number or name
acp monotime
acp notelisten [name] -- Listen for distributed notifications
acp notepost <name> [...params] -- Post distributed notifications
acp postevent <code> [string]
acp remove <code>
acp setplistvalue prop path value -- Sets <value> inside <prop> plist at <path>
acp rpc functionName [name:type:value] ...
acp rc name [cmd] -- Remote Control
acp rs name [cmd] -- Remote Show
acp static [[-remove] variable[=value]]
acp stdlog
acp sysctl <process> <variable>[=<new value>]
showrpcs -- Show all RPCs and their states
If you actually put in a command like
aegen5router# acp static
apple-minver=76000.14
apple-sn=C0PJF05xxxx
apple-sku=APAC
ethaddr=70:73xxxxx
And if you want to see all commands type acp prop
There are hundreds of commands..
Extract the setup from the Airport by using export configuration in the airport utility and you can see what some of the values are.