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Inquiry About IP-Based Bot Detection and Increasing Block Duration in reCAPTCHA v3

  • Nov 10, 2026 7:39 AM UTC
  • 1 reply
  • 7 views

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Subject: Inquiry About IP-Based Bot Detection and Increasing Block Duration in reCAPTCHA v3

Hello,

We operate a website built on Cafe24 that uses Google reCAPTCHA v3 for spam protection.

During normal website administration, we sometimes need to publish a large number of posts within a short period.

However, after multiple posts are submitted in succession, further submissions become blocked.

We have observed the following behavior:

  1. When multiple posts are submitted from the same Wi-Fi network, posting eventually becomes blocked.

  2. Switching to a different network, such as a mobile hotspot, temporarily allows posting again.

  3. After continued posting on the new network, submissions become blocked again.

  4. The duration of these restrictions appears to increase with repeated occurrences.

Cafe24 customer support has informed us that these restrictions are not caused by their own IP-blocking functionality.

We would like to clarify the following:

  • Does Google reCAPTCHA v3 evaluate repeated posting activity from the same IP address as potentially automated behavior?

  • Can such activity cause an IP address to receive a lower risk score or become temporarily restricted?

  • Does reCAPTCHA implement progressively longer restrictions for repeated suspicious activity?

  • Are there any documented thresholds or criteria related to posting frequency, IP reputation, or repeated requests?

  • Is there a recommended solution for legitimate website administrators who need to publish multiple posts in a short period?

We would appreciate any clarification regarding how reCAPTCHA handles this type of activity.

Thank you.

1 reply

faube
Staff
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  • Staff
  • Nov 10, 2026 2:30 PM UTC

Hello, reCAPTCHA allows you to configure an IP address allowlist, though I cannot confirm whether your activity is sharing IP addresses or subnetworks.

https://docs.cloud.google.com/recaptcha/docs/allowlist-ip

If you need tailored support to your activity and reCAPTCHA use case, see Getting Support:

https://docs.cloud.google.com/recaptcha/docs/getting-support