2.3.57 HostnameLookups
HostnameLookups specifies whether reverse DNS lookup is to be performed to look up host names.
Description
HostnameLookups specifies whether to perform reverse DNS lookup to look up host names to convert the IP address of the environment variable REMOTE_HOST of the CGI and the IP address of a client to be output to the log file, to host names. Note that if you use reverse DNS lookup, responses will be slow.
This directive supports IPv6 addresses.
Syntax
HostnameLookups {On|Off|double}
Specifiable values
- On
-
The IP address is converted to a host name.
- Off
-
The IP address is not converted to a host name.
- double
-
The IP address is converted to a host name. Then, the host name is converted to the IP address again, and then the IP address is checked for whether the IP address is correct.
Locations where it can be written
httpsd.conf, <VirtualHost>, and <Directory>
Example
HostnameLookups Off
The IP address is not converted to a host name.