How to add an IP to the exception or how to define topvisor?

Question

htaccess

Hello. How to determine the USER_AGENT of the topvisor site?
I use various restrictions on my site, I only allow bots or certain redirects from sites.
I decided to use the services of topvisor, but he does not get access to my site.
I look at the logs, and it only has a browser and an ip address, without any marks topvisor
Actually, how to exclude it in my .htaccess
If it leaves only such a trace

31.148.128.139 - - [25/Feb/2020:16:18:02 +0300] "GET / HTTP/1.1" 500 240 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36"

That's an example

Answer 1

by IP allow
order allow, deny
allow 31.148.128.139