Re: common log format...unresolved hosts?

Brian Behlendorf (
Thu, 13 Apr 1995 17:12:53 +0500

On Thu, 13 Apr 1995, Bob Cunningham wrote:
> In re log analysis, we fairly consistently see about 26%-27% of
> browing IP addresses showing up unresolved.
> Does that much of the Internet indeed have broken DNS reverse lookups,
> or is that high a percentage some sort of artifact of how the httpd
> server (NCSA httpd in our case) does logging?

It's not "broken" DNS reverse lookups, it's just sites that choose (for
security reasons, maybe) to not have reverse lookups enabled.