@shannonlynd If I understand correctly you want them to be able to click a link that goes to the secure zone on the site and have access to it based on their IP address. The short answer is “no”.
However. Here is what I would look at.
Are all the employees in the same office? Is the IP range and internal range?
If yes to both then is there a way to show the link in there intranet based on the IP range.
If No then your dealing with the sites external IP address, the one assigned by the internet provider. This would need to be a static IP for this to work.
{{request.request_data.ip}} gives you the external IP address. I have used it to restrict access to a secure zones.
You will still need a username and password to access the secure zone, but you can code an anonymous user into the form.
With some liquid you can display a button for the form or trigger an auto submit and redirect if the IP matches. Just know that there could be rcaptcha issues so make sure there is a fall back if the login fails.
Hope that helps. Maybe somebody else knows of a good way.