Elastic IP Group / Static IPs

Hi,

My employer is looking to deploy Amazon Workspaces to around ~25 users, but I need to have IP restrictions for getting into our applications and such.

It seems the Workspace maintains the same internal IP at AWS, but I can't guarantee the external IP address. I've created some Elastic IPs and assigned them to the workspaces but we've reached our limit and I'm unsure if there's a better way than requesting 25+ elastic IPs to accommodate all the workspaces.

I'm new to AWS, so does anyone have any suggestions for how to pool these IPs or at least have a smaller range of possible IPs these workspaces may use?

Thanks!