IP Whitelisting

IP whitelisting lets you restrict API access to a set of known IP addresses. When enabled, any request from an IP not on your whitelist will be rejected with 403 Forbidden, even if it includes a valid API key.

This is recommended for server-to-server integrations where your API calls always originate from known infrastructure.

Setting up IP whitelisting

Manage your IP whitelist in the portal:

1. Log in to the eSIM Go Portal
2. Navigate to Account Settings → API Details → IP Whitelist
3. Add the IP addresses your systems will make API calls from

Important notes

Caution

If you enable IP whitelisting and do not add any IP addresses, all API requests will be rejected. Make sure to add your IP addresses before enabling.

• Whitelist your IP addresses before testing the feature
• If your infrastructure uses dynamic IPs, consider whether IP whitelisting is appropriate for your setup
• Requests blocked by IP whitelisting return the same 403 Forbidden response as an invalid API key — the response does not indicate which check failed