To use reCAPTCHA, you need to sign up for API keys for your site. Unless you select the "global key" option, the keys are unique to your domain and sub-domains. (By default, all keys work on "localhost" (or "127.0.0.1"), so you can always develop and test on your local machine.)

Thanks Priya. As per your suggestion, we always have IP or domain name dependency with keys.
Is there any way to avoid this dependency.