Starting today, Amazon EC2 C5n instances are available in the AWS Asia Pacific (Tokyo), Europe (Frankfurt), and AWS GovCloud (US-East) Regions. C5n instances, first introduced in November of 2018, are variants of C5 instances with significantly higher network performance across all instance sizes, ranging from 25 Gbps of peak bandwidth on smaller instance sizes to 100 Gbps of network bandwidth on the largest instance size. In addition, C5n instances also feature 33% higher memory footprint compared to C5 instances. C5n instances are ideal for applications that can take advantage of improved network throughput and packet rate performance.
from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/05/amazon-ec2-c5n-instances-are-now-available-in-additional-regions/