Atlassian
Atlassian publishes a machine-readable JSON of cloud IP ranges covering Jira, Confluence, Bitbucket, Opsgenie, Statuspage, and other products. The data is filterable by product, direction (egress/ingress), region, and IP version.
Autonomous systems
Network background
Atlassian Cloud runs on AWS and other providers. The IP ranges change over time; use the JSON API for automated allowlist management.