Firewalls and reCAPTCHA

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If you are using a firewalls, you will need to have outbound access to api-verify.recaptcha.net. This address can be hosted on different IP addresses depending on the location of your server. You should add access to port 80 on all of the following IP ranges:

  • 64.34.251.144/28 (64.34.251.144 - 64.34.251.159)
  • 69.12.97.160/27 (69.12.97.160 - 69.12.97.191)
  • 87.233.189.0/27 (87.233.189.0 - 87.233.189.31)

From time to time, we may add new IP addresses to this list. We will give at least one week's notice on our public mailing list before implementing the change.

Retrieved from "http://wiki.recaptcha.net/index.php/Firewalls_and_reCAPTCHA"