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| .TH "LOGRESOLVE" 1 "2026-04-30" "Apache HTTP Server" "logresolve" | |
| .SH NAME | |
| logresolve \- Resolve IP-addresses to hostnames in Apache log files | |
| .SH "SYNOPSIS" | |
| .PP | |
| \fB\fBlogresolve\fR [ -\fBs\fR \fIfilename\fR ] [ -\fBc\fR ] < \fIaccess_log\fR > \fIaccess_log\&.new\fR\fR | |
| .SH "SUMMARY" | |
| .PP | |
| \fBlogresolve\fR is a post-processing program to resolve IP-addresses in Apache's access logfiles\&. To minimize impact on your nameserver, logresolve has its very own internal hash-table cache\&. This means that each IP number will only be looked up the first time it is found in the log file\&. | |
| .PP | |
| Takes an Apache log file on standard input\&. The IP addresses must be the first thing on each line and must be separated from the remainder of the line by a space\&. | |
| .SH "OPTIONS" | |
| .TP | |
| \fB-s \fIfilename\fR\fR | |
| Specifies a filename to record statistics\&. | |
| .TP | |
| \fB-c\fR | |
| This causes \fBlogresolve\fR to apply some DNS checks: after finding the hostname from the IP address, it looks up the IP addresses for the hostname and checks that one of these matches the original address\&. | |