How to restrict the SSH login to a specific ip or host?

Step 1:- Login to the server

ssh username@ip -p portnumber

Step 2:- Find the hosts.deny file in /etc

cd /etc/
vi hosts.deny

Include the following line sshd: ALL Save & exit the file

Step 3:- Find hosts.allow file in /etc

vi hosts.allow

Include the following line

sshd: required ip

Save & exit the file

Note: We can login the server through the particular ip as mentioned on hosts.allow file

Step 4:- Exit the server.