Difference between REMOTE_HOST and REMOTE_ADDR

Question

What is the difference between these two variables?

REMOTE_HOST and REMOTE_ADDR.

Answer 1

REMOTE_HOST pertains to the hostname of the client (i.e. the computer making the request). REMOTE_ADDR refers to the IP address of the client.

There would be times when the hostname is unresolvable so the REMOTE_HOST will return the REMOTE_ADDR or the IP address instead.

Answer 2

1. $_SERVER['REMOTE_ADDR'] - This contains the real IP address of the client. That is the most reliable value you can find from the user.

2. $_SERVER['REMOTE_HOST'] - This will fetch the Host name from which the user is viewing the current page. But for this script to work, Hostname Lookups On inside httpd.conf must be configured.

Answer 3

Remote: is a computer that resides in some distant location from which data retrieved it typically refer to a server in a private network or the public internet.

Remote_ host will return the REMOTE_ ADDR Or the IP address instead .