Forum Moderators: DixonJones
The c-ip field, preferably in combination with the User Agent field.
If you have no cookies, use the IP address (c-ip) and User Agent fields.
In all cases, check the time of the hits.
Excel is helpful when doing this.
The best you can do expect out the box is to find unique sessions, as defind by a simple maximum session length heuristic. Depending on what analysis you are doing it may be good enough. It falls down big time when you have long sessions , sessions containing additional SERPS in the middle, users behind a proxy or users with cookies disabled.