whois eurid.eu

I returned the following message:

No whois server is known for this kind of object.

So you can simply use:

whois -h whois.eu eurid

but from `man whois` I read:

If the /etc/whois.conf config file exists, it will be consulted to find
a server before applying the normal rules. Each line of the file should
contain a regular expression to be matched against the query text and
the whois server to use, separated by white space.

So I created the /etc/whois.conf file and filled it with:

.eu whois.eu

but it doesn’t work. From the output of:

strace /usb/bin/whois  eurid.eu

we can see that the program doesn’t search /etc/whois.conf file so the “problem” is in the source.
To get whois read his config file you must download the program source from his developer web site

http://www.linux.it/~md/software/

then you need to extract the files from the archive and modify config.h simply to uncomment the line regarding /etc/whois.conf as reported:

#define CONFIG_FILE "/etc/whois.conf"

finally you have to recompile the program with make and install it.
Now that whois read his config files you can create it

# echo ".eu whois.eu" > /etc/whois.conf

and launch the program

whois  eurid.eu

Now in the output you have the whois search result.