cPanel & WHM version 11.40 offers support for IPv6 and 1:1 NAT, an API Shell, and more. IPv6 Support cPanel & WHM is now IPv6-enabled with dual-stack support, allowing customers to add IPv6 or IPv4 to any account. This feature prepares our customers for future demand. 1:1 NAT Support cPanel & WHM version 11.40 provides 1:1 NAT, giving customers the ability to support a broader range of hosting environments. API Shell In 11.40, cPanel & WHM includes an API Shell, enabling customers to run and troubleshoot API calls interactively through the cPanel & WHM user interfaces. This feature helps our customers better understand API calls.