This article contains the most up-to-date IP addresses used for Greenhouse Software's HRIS Link, API, outbound webhooks, and custom SMTP traffic. Depending on your organization's security practices, you may need to allowlist these IPs.
Organizations setting up a custom SMTP relay should allowlist all the IP addresses in the table below, based on their organization's assigned silo.
| Silo | IP address | Region |
| Silos 1-9 | 52.20.168.64 | us-east-1 |
| Silos 1-9 | 52.70.216.197 | us-east-1 |
| Silos 1-9 | 52.20.64.141 | us-east-1 |
| Silos 1-9 | 52.70.198.126 | us-east-1 |
| Silos 1-9 | 52.70.198.130 | us-east-1 |
| Silos 1-9 | 52.70.198.132 | us-east-1 |
| Silos 1-9 | 34.210.95.47 | us-west-2 |
| Silos 1-9 | 34.210.126.35 | us-west-2 |
| Silos 1-9 | 54.70.1.6 | us-west-2 |
| Silos 1-9 | 34.212.151.47 | us-west-2 |
| Silos 1-9 | 34.218.33.219 | us-west-2 |
| Silos 1-9 | 35.165.21.138 | us-west-2 |
| Silo 101 | 3.126.6.8 | eu-central-1 |
| Silo 101 | 52.59.140.243 | eu-central-1 |
| Silo 101 | 3.125.245.140 | eu-central-1 |
| Silo 101 | 18.194.108.205 | eu-central-1 |
| Silo 101 | 3.121.45.252 | eu-central-1 |
| Silo 101 | 52.28.54.35 | eu-central-1 |
| Silo 101 | 54.72.113.125 | eu-west-1 |
| Silo 101 | 52.210.241.76 | eu-west-1 |
| Silo 101 | 34.255.47.8 | eu-west-1 |
| Silo 101 | 54.194.7.0 | eu-west-1 |
| Silo 101 | 54.246.134.222 | eu-west-1 |
| Silo 101 | 99.81.131.89 | eu-west-1 |
| Silo 201 | 3.24.87.169 | ap-southeast-2 |
| Silo 201 | 13.210.86.22 | ap-southeast-2 |
| Silo 201 | 54.79.10.87 | ap-southeast-2 |
| Silo 201 | 13.54.163.226 | ap-southeast-2 |
| Silo 201 | 3.104.12.119 | ap-southeast-2 |
| Silo 201 | 3.24.194.67 | ap-southeast-2 |
| Silo 201 | 16.50.226.240 | ap-southeast-4 |
| Silo 201 | 16.26.36.113 | ap-southeast-4 |
| Silo 201 | 16.26.26.33 | ap-southeast-4 |
| Silo 201 | 16.26.37.40 | ap-southeast-4 |
| Silo 201 | 16.26.45.58 | ap-southeast-4 |
| Silo 201 | 16.50.167.146 | ap-southeast-4 |