Log files contain
information about user hosts. It may be either a domain name or an
IP address. For example 220.127.116.11 is an IP address of the user.
We can resolve this IP address (do DNS lookup or, more accurate,
reverse DNS lookup) and determine that this address corresponds to
mtl-hse-ppp202789.qc.sympatico.ca. WebLog Expert uses domain names
to determine top-level domains.
In some cases IP
addresses are already resolved in the log files. But usually they
are not. WebLog Expert has a capability of resolving IP addresses.
If this option is set to ON in the profile the program will do DNS
lookups before analyzing logs. You must be connected to Internet
during DNS lookup.
Some IP addresses don't
have corresponding domain names so there may be IP addresses shown
in the reports even with the Lookup DNS Names option enabled.
The program uses
multiple threads to perform the DNS lookups. The program also
caches the lookups. So if the program needs to resolve the IP name
that is always in cache it won't need to repeat the DNS
You can use the
category of the Options dialog to specify various lookup options.