DigitalOcean Cloud Firewalls are available at no additional cost.
Firewalls are available in every region. A Firewall’s rules can include servers from any combination of regions.
You can have a maximum of 10 Droplets per Firewall and 5 Tags per Firewall. You can have an unlimited number of Firewalls per Droplet.
Each Firewall can have up to 50 total incoming and outgoing rules.