Excerpt from the book I am reading:
Most web servers can be configured to convert client IP addresses into client hostnames, using “reverse DNS.” Web servers can use the client hostname for detailed access control and logging.
I am a little confused about client hostname identification. I thought the clients don't even have hostnames, just IP addresses. I understand that servers are identified by hostnames a.k.a. domain names, but I can't make the connection between identifying browser by hostname. What exactly do you identify when identifying client hostname? Just the IP address?