vaniivan

This plugin warns you of server IP address changes, so you can take care of Search Engine Visibility settings. 
This can happen if you move your database between development, staging and production environments, or on the first deployment of your site. 
It’s bad to keep robots.txt on for production, but could also be bad if you leave the robots.txt off on staging or development, 
since the whole staging.example.com domain could be indexed by Search Engines.
<h3>External Services</h3>
This plugin makes use of the http://ipecho.net service for external IP address resolution. More info here: https://ipecho.net/developers.html

A3 Robots Warning

Warns you of server IP address changes, so you can take care of Search Engine Visibility settings.

Gobookmart

GoBookMart Robots Editor is a simple yet powerful WordPress plugin that lets you create, view, and modify your robots.txt file without needing FTP access or coding skills.
Key Features: 
* Create or edit robots.txt from WordPress admin. 
* Auto-generate a default SEO-friendly robots.txt. 
* Save edits directly to your site root. 
* Secure file handling using WordPress filesystem API. 
* Lightweight, fast, and easy to use.
Perfect for SEO experts, developers, and site owners who want full control over how search engines crawl their websites.
Developed by <a href="https://gobookmart.com" rel="nofollow ugc">GoBookMart.com</a>.

GoBookMart Robots Editor

A lightweight plugin to edit or create robots.txt directly from your WordPress dashboard. Developed by GoBookMart.

A3 Robots Warning vs GoBookMart Robots Editor