well if you're running apache.. one solution would be to install geoip apache module from
Maxmind and then do a mod_rewrite sort of like
RewriteEngine on
RewriteCond %{ENV:GEOIP_COUNTRY_CODE} ^NL$
RewriteRule ^.*$
http://www.fuckoff.com [R]
probably simpler solutions around, but that's the first thing I thought of.