# IP Provisioning API: IP Operations

The Twilio SendGrid IP Provisioning API provides a platform for Twilio SendGrid resellers to manage their customer accounts' IPs. This API is for companies that have a formal reseller partnership with Twilio SendGrid.

You can access Twilio SendGrid sub-account functionality without becoming a reseller. If you require sub-account functionality, see the Twilio SendGrid Subusers feature, which is available with [Pro and Premier plans](https://sendgrid.com/pricing/).

The IP Provisioning API IP operations allow you to add, list, and remove IPs from customer accounts.