IP Addresses

Basis Theory hosts its systems in multiple regions, but utilizes a list of static IP addresses for all outbound network traffic that your systems and firewalls can whitelist for inbound traffic. These IP addresses are static - we will make the best effort to attempt to give 30-day notifications to changes to this list. The following is a list of IP addresses by environment/region for Basis Theory systems:

Production

United States

• 18.223.139.88
• 35.85.10.157

Europe

• 3.79.164.35
• 54.154.39.83

Test

United States

• 18.191.73.1
• 52.13.142.52

The Test environment IP addresses will become active on March 30, 2026. If you have IP allowlists configured for third-party systems or webhook consumers, please add these addresses before this date to avoid service interruptions for Test Tenant traffic. See Test Tenants for more details.

For security reasons, the only egress port enabled by default is 443. Please, reach out for support if you require a different egress port opened.