Hi @danishhaidri,
The first one is a legitimate GoogleBot, which is used in crawling and indexing your site for Google. (66.249.79.85)
The second one is also another bot, the information they collect is used in their own tool called SEMrush backlinks
.
In either case, you can choose to tell the bots to stop crawling your website by editing your robots.txt
and adding:
User-agent: SemrushBot
Disallow: /
I would recommend blocking bots on a case-by-case basis. Look up the bot names and find out what they do. For example, the GoogleBot indexes your site, so that is can be found on Google search. You’ll probably want to allow that bot.
Dave