How is my IP address detection *still* wrong?

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Emily White Author
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19 hours ago Asked
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2 Replies
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hey folks, remember that "my public ip is wrong!" thread? well, i thought i had it sorted, but seems like my ip address detection script for getting my external ip address is still playing games with me.

i've been trying to verify my public ip again, especially since i'm doing some geo-targeting tests for my saas. but no matter what i try, my server's detection logic keeps spitting out something... off. it's not even my vpn's ip sometimes, just some random internal-looking thing.

here's what my simple python script (which just hits a public ip API) is showing:


$ python get_my_ip.py
Detected Public IP: 10.0.0.5
Timestamp: 2024-07-25 14:30:01

like, seriously? 10.0.0.5? i'm not running a local proxy or anything obvious. what could possibly be messing with my public ip detection *this* consistantly?

ip Network detection wrongip

2 Answers

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Lucia Rodriguez
Answered 6 hours ago
"my server's detection logic keeps spitting out something... off. it's not even my vpn's ip sometimes, just some random internal-looking thing."
I've definitely hit this wall myself when trying to nail down geo-targeting for SaaS growth, so I understand how frustrating it is to see an internal IP like 10.0.0.5 when you're expecting your public egress IP. This isn't just a script error; it points to how your server's network is configured and where your script is actually executing its request from. Here's a breakdown of why this happens consistently and what to check:
  1. Understanding Private IP Ranges:

    The IP address 10.0.0.5 falls within a private IP address range (10.0.0.0/8). These are non-routable on the public internet and are reserved for internal networks (LANs). When you see this, it means your script is detecting an IP address that's internal to a local network segment, not what the rest of the world sees.

  2. Network Address Translation (NAT) & Routers:

    Your server, like most devices connected to the internet, is almost certainly behind a router or firewall performing Network Address Translation (NAT). This device has a single public IP address (or a pool of them) that it uses to communicate with the internet. All devices on your internal network (like your server with 10.0.0.5) share this public IP when they make outbound connections.

    Your Python script, when run on the server, is asking "what's my IP?" from its *own* perspective, which is its private IP on the local network. The public IP API, however, sees the IP address of the NAT device (your router/firewall) that forwarded the request.

  3. Proxy Servers or Load Balancers:

    If your server is part of a more complex network topology, especially in a cloud environment or a corporate setup, it might be sitting behind an explicit proxy server or a load balancer. When your script makes an outbound request, it first hits this internal proxy/load balancer, which then forwards the request to the public IP API. The API then sees the IP of the proxy/load balancer, not necessarily the *true* public IP of your entire network, and certainly not your server's internal IP.

    In such cases, the proxy might add an X-Forwarded-For header to the request, which contains the original client's IP. However, your simple Python script hitting a public IP API isn't designed to parse these headers on the *response* side; it's looking at the source IP of its own outbound connection.

  4. Containerization (Docker, Kubernetes):

    If your script is running inside a Docker container or a Kubernetes pod, it's operating within its own virtual network. The 10.0.0.5 could be the IP address assigned to the container itself within its Docker bridge network, before it even hits the host's NAT or any external network configuration.

What to do to get the correct public IP:

  1. Run a Command that Queries an External Service:

    The most reliable way to get your public IP (the one the world sees) is to ask an external service directly. Your Python script is *trying* to do this, but the environment it's running in might be obscuring the true public IP.

    From your server's command line, try:

    
curl ifconfig.me
# or
curl ipecho.net/plain
# or
dig +short myip.opendns.com @resolver1.opendns.com

    These commands directly query a service that responds with the IP address it *sees* your request coming from. This is your public egress IP.

  2. Review Your Server's Network Configuration:

    If you're in a cloud environment (AWS, GCP, Azure, etc.), check the network interface settings for your VM. It will likely have a private IP (like 10.0.0.5) and an associated public IP assigned by the cloud provider. Your script is picking up the private one.

  3. Check for Local Proxy Settings:

    Even if you think you're not running one, double-check environment variables (http_proxy, https_proxy) or system-wide proxy configurations on your server that might be routing your script's traffic through an internal proxy.

The key takeaway here is that your script is correctly reporting the IP address of the *interface it's using to communicate*, which in your case is an internal one. To get the public IP, you need to rely on what an external service sees, which is typically the IP of the NAT device or load balancer your traffic passes through on its way out. Hope this helps your geo-targeting efforts and conversions!
0
Emily White
Answered 2 hours ago

Lucia Rodriguez, thanks so much for this detailed breakdown! Using curl ifconfig.me totally cleared up why my script was getting the internal IP, and now I'm consistently seeing the correct public egress IP for my server. However, I'm still scratching my head a bit because while the IP itself is right, the geo-location services I'm using to verify for my SaaS are still sometimes placing it in a completely different city, which is really throwing off my geo-targeting tests.

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