Check if a specific IP address is a CDN POP IP address - CDN

Once you connect your origin server to Alibaba Cloud CDN, use the IP Address Detector to check if a CDN Point of Presence (POP) is serving client requests. This check verifies that content acceleration is working correctly.

Use cases

Verify CDN integration: After you configure the CNAME record for your domain name, confirm that user traffic is routed to a POP instead of your origin server.
Troubleshoot production issues: When users report slow performance or timeouts, determine if their requests are being routed through the CDN.
- If the CDN serves the request, the issue might be with the POP, the origin-pull process, or the origin server.
- If the CDN does not serve the request, the issue is likely related to DNS resolution or the client's local environment.

Procedure

Step 1: Get the IP address to check

Method 1: (Recommended) Use browser developer tools

In Google Chrome or Microsoft Edge, press F12 to open Developer Tools, and then switch to the Network tab.
Visit your Alibaba Cloud accelerated domain name (for example, your CDN domain).
In the request list, click the main page request, which is typically of type document.
In the details pane, find Remote Address. This is the IP address of the Alibaba Cloud POP that served your request.

Method 2: Use the curl command
Run the following command. The IP address appears after Connected to in the output.

# Replace <Your Accelerated Domain Name> with your actual accelerated domain name.
curl -vso /dev/null https://<Your Accelerated Domain Name> 2>&1 | grep "Connected to"

Step 2: Use the IP Check tool

Console (Recommended)

On the IP Address Check page in the CDN console, enter the IP address to check and click Check.

API

Call the BatchDescribeCdnIpInfo operation to check in batches whether IP addresses belong to CDN POPs.

Note

You can check IPv4 and IPv6 addresses.
You can check up to 20 IP addresses at a time.

FAQ

What does it mean if the IP Address Detector shows an IP is an Alibaba Cloud CDN POP?

It confirms that the IP address belongs to a CDN POP. The tool will also display the POP's region and ISP.

This information helps you confirm which specific POP served a client's request, which is useful for diagnosing location-specific network performance issues.

Why does the IP Address Detector report that an IP is not a CDN POP?

This result means the IP address was not found in the Alibaba Cloud CDN POP database. This typically happens for one of the following reasons:

You are checking the wrong IP address. The IP you entered might not be the one that served the request for your accelerated domain.
Solution: Follow the instructions in Step 1: Get the IP address to check to find the correct IP address that your client connected to.
Your request is connecting directly to the origin server, bypassing the CDN. This can happen if your DNS or local environment is misconfigured.
Solution: Verify the following:
- Domain is correctly added to CDN: Ensure your domain name has been fully added and configured in the Alibaba Cloud CDN console.
- DNS points to CNAME: Your domain's DNS record must point to the CNAME address provided by Alibaba Cloud CDN, not your origin server's IP.
- No local overrides: Check your local hosts file and any active network proxies to ensure they are not forcing a direct connection to your origin server.
The IP is a private, loopback, or non-public address. The tool cannot validate internal IP addresses.
Solution: Ensure the IP you are checking is a public IP. Addresses like 127.0.0.1, 192.168.x.x, or 10.x.x.x are for private networks and cannot be CDN POPs. Always test from a public network environment.