Twilio is announcing the introduction of CIDR Block support for IP Access Control List (ACL) used in SIP Interfaces and Elastic SIP Trunking products, allowing customers to define an IP address range with a network prefix to improve security and save time. This feature can be easily accessed through both the Console and API, enabling customers to block communications from rogue hosts and making IP ACLs more scalable. The new control also provides a quick and easy way to add or update IP addresses in access control lists, reducing the need for manual intervention.