Get yourself familiarize with the following limitations before using Elastic IP Address (EIP).

Generic limitations

  • Up to 20 Elastic IP Addresses can be created per account. Open a ticket to apply for more.
  • You can bind an EIP to a resource only when the status of the EIP is available.
  • The binding of an EIP takes effect immediately.
  • An EIP can be bound to only one resource at a time.
  • An EIP address that is locked because of security reasons cannot be bound or unbound.

Limitations on binding ECS instances

  • The ECS instance must be in a VPC network.
  • The ECS instance and the EIP must be in the same region.
  • The ECS instance must be running or stopped.
  • The ECS instance does not have a public IP, nor is it bound to any EIP.
  • An ECS instance can only be bound to one EIP.

Limitations on binding NAT Gateway

  • No bandwidth package was purchased before January 26, 2018 under the account that the NAT Gateway belongs to.
  • The NAT Gateway and the EIP must be in the same region.
  • Up to 10 Elastic IP Addresses can be bound to a NAT Gateway.

Limitations on binding SLB

  • The SLB instance must be in a VPC network.
  • The SLB instance and the EIP must be in the same region.
  • An SLB instance can be bound to one EIP at a time.