Whitelisting ContentKing monitoring on Cloudflare

Content delivery networks (CDN) are increasing in popularity among all kinds of businesses and website owners, who use CDNs as a way of increasing the performance and security of their websites. The best known and most used CDN provider is Cloudflare.

If you are using Cloudflare’s CDN and you also want to monitor your website with ContentKing, it can happen that our crawlers get blocked by Cloudflare’s firewall.

If this happens, ContentKing is not able to access and monitor your website.

Ensuring ContentKing’s access to your website

To ensure that ContentKing can access and monitor your website, you need to whitelist all of our crawl IP addresses in your Cloudflare account.

You can find ContentKing’s crawl IP addresses in this support article.

How to whitelist ContentKing’s IP addresses in Cloudflare

  1. Log in to your Cloudflare account
  2. Click the Firewall icon and then on the Tools tab
  3. List ContentKing’s crawl IP addresses under the IP Access Rules:
    a) Enter the IP address
    b) Choose Whitelist as the action
    c) Choose the website to which the whitelisting rules will apply
  4. Click Add
  5. Repeat with all of our crawl IP addresses

After whitelisting the IP addresses, ContentKing will be able to access your website and monitor it properly.

IP address ranges

As of yet, Cloudflare only supports subnets with the minimum of 254 IP addresses (subnet mask /24 and lower). Our IP address ranges use the /27 and /28 subnet masks which are not supported by Cloudflare at this moment.

Therefore, our IP addresses need to be entered with the /24 subnet mask.

Example: one of our crawl IP address ranges is This needs to be listed in your Cloudflare account as

For more information about Cloudflare’s IP Access Rules you can also refer to Cloudflare’s support documentation (opens in a new tab) on this matter.

In case of any questions don’t hesitate to contact us!