SSH Restricted by IP

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Add following to sshd_config file

## Block root login to every one ##
PermitRootLogin no
 
## No more password login  ##
PermitEmptyPasswords no
PasswordAuthentication no
 
## Okay allow root login with public ssh key for 192.168.2.5 only ##
Match Address 192.168.2.5
        PermitRootLogin yes

Refer – https://www.cyberciti.biz/faq/match-address-sshd_config-allow-root-loginfrom-one_ip_address-on-linux-unix/