Server receiving hit from this IP Address "::ffff:". Why is that and how to resolve this?

I have a MEAN Stack application deployed on a server and I am using Nginx as proxy server to handle the request and redirect to application’s particular port.

I wrote a short script in node.js which fetches IP and location of the users visiting my website. I can see the searched queries and usage of my API from external users and are same as those I can see via Google Analytics.

But I am also getting a strange hit to my server (and API links) from the IP address “::ffff:”. Why is that? Is that because of Nginx? How can I resolve this? Is this even an actual user or what?

Someone suggested that it might because of the Monitoring tool installed on your server. Can this be the reason as well or its something else?


I have done that already and that works fine. On the node.js side, I believe i am capturing the user’s IP with this code var getClientAddress = (req.headers['x-forwarded-for'] || '').split(',')[0] || req.connection.remoteAddress; with “satelize” package via NPM. It response with the desired output for external users but there are some internal hits from my own localhost I need to know why is it so.

Hi @ok91 Have you ever solved this issue? I’m having the same problem. Was the reason the built-in monitoring?

Hi @ok91

This is the IP address of your proxy server “localhost” you need to tell Nginx to send this header X-Forwarded-For to enable your backend server to discover the real client’s IP address.

Check here for more info.

Hope this helps you.

Submit an answer
You can type!ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.


::ffff: is the IPv6 version of an IPv4 IP address, just to clarify.

What does your current NGINX server block look like? (the one that has the proxy configuration)