Elastic Load Balancing now supports the UDP protocol on Network Load Balancers, in addition to the already supported TCP protocol. With this launch, you can deploy services that rely on the UDP protocol, such as Authentication and Authorization, Logging, DNS, and IoT, behind a Network Load Balancer, benefiting from its low latency, scale, and reliability.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/06/network-load-balancer-now-supports-udp-protocol/