CircleCI

Official

CircleCI publishes a JSON file of IP ranges for macOS builds, jobs using the IP ranges feature, and core cloud services. Use their documentation for feature scope, DNS-based listings, and change policy.

CircleCI - official IP ranges (JSON)

Official feed

Jobs/core entries are often single hosts; macOS ranges differ — use the vendor groupings as published.

https://circleci.com/docs/ip-ranges-list.json

Documentation

CircleCI - restrict pipeline traffic (IP ranges)

Verify current addresses against CircleCI’s DNS aggregate.

dig all.knownips.circleci.com A +short

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