MongoDB Atlas
MongoDB Atlas publishes an unauthenticated JSON API of control-plane inbound and outbound IP addresses by cloud provider and region. Use it when allowlisting Atlas management traffic, webhooks, or KMS callbacks. Requests require an Atlas API Accept media type.
MongoDB Atlas control-plane IP addresses Official feed
curl -sS -H 'Accept: application/vnd.atlas.2025-03-12+json' 'https://cloud.mongodb.com/api/atlas/v2/unauth/controlPlaneIPAddresses'