Here's the fields followed by a description:
Hostname or IP address of client
arrow.a.com. (In this case, the hostname is shown because the web server's setting for DNS lookups is enabled; if DNS lookups were disabled, the client's IP address would appear.
RFC 931 information
john (username entered by the client for authentication)
Date/time of request
Hello! I have more than five implementations of iplanet log files format string. Because a format of any web access log depends on the administrator who manages server.
Give me a few rows of your own log file and I'll give you exact string of field extraction