If you are having difficulty with a WPMU DEV service not working properly for you, it may be that one or more of our IP addresses are being blocked by a firewall at your host, or a firewall feature in a security plugin you may have installed.

To fix that, you can add our IP addresses to an allowed list in your security plugin or your host’s firewall to allow the connection between your server and ours to proceed unimpeded.

Following are the IP addresses we use for all our services. We recommend adding all of them to your allowed list, but you can of course only add those you need.

WPMU DEV site
18.204.159.253
54.227.51.40

WPMU DEV Hosting API
18.219.56.14

SmartCrawl
45.55.78.242
35.171.56.101

WP Scan
192.241.140.159
104.236.132.222
192.241.148.185

Uptime
34.196.51.17
35.157.144.199

WP-Smush
159.89.254.12

Snapshot 4
35.157.144.199
34.196.51.17
18.204.159.253
54.227.51.40

If you want to add all of the above IP addresses in one go, here’s the full list with no headings so you can just copy/paste it to your allowed list:

8.1 Allow List Guides

Copy chapter anchor to clipboard

This section provides guidance on adding WPMU DEV’s IP addresses to the allow list in popular security plugins and hosts’ firewalls.

8.1.1 Cloudflare

Link to chapter 1

On Cloudflare’s dashboard, go to Security > WAF > Tools. Under the IP Access Rules section, add WPMU DEV’s IP address that you want to whitelist, change Block to Allow, add Notes if needed, and click the Add button.

Please note that you can add one IP address at a time.

Adding WPMU DEV IP addresses to Cloudflare

8.1.2 WordFence

Link to chapter 1

In your WordPress Dashboard, go to Wordfence > All Options. Under the Firewall Options section, click on the Advanced Firewall Options to reveal the settings. Add WPMU DEV’s IP addresses to the Allowlisted IP addresses that bypass all rules field then click the Save Changes button.

Adding WPMU DEV's IP addresses to WordFence