Log more than just a single last used IP address for a user
My request would be for 3 or more IP Addresses
Generally I find that users are logging in simultaneously from multiple devices including:
Home Desktop
Home Tablet
Mobile Phone
Work Computer
A single IP is a bit pointless - whilst the two home connections may appear to be from the same IP address I usually find that the Mobile phone connects over 3G and work computer another IP.
This helps deal with systems administration, multiple accounts issues, debugging error reports found in logs and other usual items where IP address is used.
In my experience with vB it was usually the Registration IP that was more helpful in spotting and identifying problem accounts.
But there have been a lot of times where knowing the Posting IP was helpful.
Because Last IP can be transient, you do have to be a lot quicker if you’re wanting to use it.
Sure long term we should store ip addresses of all logged on sessions and allow admins to log off particular sessions selectively or get info about them.
It’s pretty common on major sites for them to enter “freak out mode” when a user suddenly logs in from a very different IP address than they usually do, from a country halfway across the world.