What are the IP ranges for TeamCity Cloud servers?

The following IP ranges are used for the TeamCity Cloud servers:

54.155.204.237/32
79.125.74.147/32
63.32.4.62/32
52.17.73.242/32
52.209.101.160/32
34.251.114.150/32

For whitelisting purposes, outbound connections from a TeamCity Cloud server will originate from one of the IP addresses listed above.

The following IP ranges are used for the JetBrains-hosted build agents:

52.49.162.42/32
52.214.29.36/32 
185.223.133.26/32
34.255.77.87/32
52.208.252.98/32

For whitelisting purposes, outbound connections from a JetBrains-hosted build agent will originate from one of the IP addresses listed above.

To look up these IP ranges programmatically, you can use this JSON-based endpoint:

https://meta.teamcity.com/cloud-public-metadata/tcc-addresses-eu-west-1.json

TeamCity Cloud domain names (*.teamcity.com) have dynamic IP addresses associated with them via AWS CloudFront – these IP addresses should not be used for whitelisting. If you wish to whitelist connections originating from your own internal network to a TeamCity Cloud server, you should whitelist by hostname rather than IP address.