Available in: Enterprise, Performance, Unlimited and Developer Editions
You may notice that the feature 'Lock sessions to the domain in which they were first used' is available in Session Settings, but 'Lock sessions to the IP address from which they originated' is missing.
You can check by navigating below:
Salesforce Classic
Lightning Experience
Note: You must be an Administrator or have the 'View Setup and Configuration' set on the profile to access 'Session Settings'.
The setting to 'Lock sessions to the IP address from which they originated' is only available in Enterprise, Performance, Unlimited and Developer Editions organizations. If your organization is not among these, then you will not have access to this setting.
Exceptions: Lock session IP to which originated (in session settings) if checked this can log out users that are not within single IP sessions, recommended to keep unchecked for best results. This works as designed when checked.
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