You may want to bring your own IP addresses to AWS for the following reasons: IP Reputation: Many customers consider the reputation of their IP addresses to be a strategic asset and want to use those IPs on AWS with their resources. For example, customers who maintain services such as outbound e-mail MTA and have high reputation IPs, can now bring over their IP space and successfully maintain their existing sending success rate.
Customer whitelisting: BYOIP also enables customers to move workloads that rely on IP address whitelisting to AWS without the need to re-establish the whitelists with new IP addresses.
Hardcoded dependencies: Several customers have IPs hardcoded in devices or have taken architectural dependencies on their IPs. BYOIP enables such customers hassle free migration to AWS.
Regulation and compliance: Many customers are required to use certain IPs because of regulation and compliance reasons. They too are unlocked by BYOIP.
On-prem IPv6 network policy: Many customers can route only their IPv6 in their on-prem network. These customers are unlocked by BYOIP as they can assign their own IPv6 range to their VPC and choose to route to their on-prem network using internet or Direct Connect.