This topic describes the limits on the use of elastic IP addresses (EIPs). We recommend that you read and understand these limits before you use EIPs.

General limits

The following general limits apply to EIPs:
  • You can apply for up to 20 EIPs with each account.

    Go to the Quota Management to increase the quota. For more information, see Quota management.

  • An EIP can be associated with only one cloud resource. The associated EIP must be in the Available state. The configuration immediately takes effect after the association.
  • EIPs that are locked for security reasons cannot be released, associated with, or disassociated from other cloud resources.
  • The following table lists the bandwidth limits on EIPs.
    Pay-by-data-transfer EIPs Pay-by-bandwidth EIPs
    Each pay-by-data-transfer EIP supports a maximum bandwidth of 200 Mbit/s. This value indicates the upper limit of bandwidth usage and is intended for informational purposes only. It is not a guaranteed performance and is for reference only. In scenarios where demands exceed resource supplies, the maximum bandwidth may be limited. Each pay-by-bandwidth EIP supports a maximum bandwidth of 500 Mbit/s. This value is a guaranteed performance of the service. In scenarios where demands exceed resource supplies, the maximum bandwidth is guaranteed.
    The sum of the maximum bandwidth of all pay-by-data-transfer EIPs in a single region cannot exceed 5 Gbit/s. If your business requires a guaranteed or larger maximum bandwidth, you must purchase pay-by-bandwidth EIPs. The sum of the maximum bandwidth of all pay-by-bandwidth EIPs in a single region cannot exceed 50 Gbit/s. You can contact your product manager to increase the quota.
  • The following limits apply to the inbound and outbound bandwidth for EIPs purchased after 00:00 (UTC+8) on February 15, 2020:
    • Inbound bandwidth
      • If you purchase an EIP with a maximum bandwidth of at least 10 Mbit/s, Alibaba Cloud allocates the inbound bandwidth that equals to the maximum bandwidth to the EIP.
      • If you purchase an EIP with a maximum bandwidth that is lower than 10 Mbit/s, Alibaba Cloud allocates an inbound bandwidth of 10 Mbit/s to the EIP.
    • Outbound bandwidth

      Alibaba Cloud allocates the outbound bandwidth that equals the maximum bandwidth to the EIP.

Limits on associating an EIP with an ECS instance

Note the following limits before you associate an EIP with an Elastic Compute Service (ECS) instance:
  • The ECS instance must be deployed in a Virtual Private Cloud (VPC) network.
  • The ECS instance and the EIP must be deployed in the same region.
  • The ECS instance must be in the Running or Stopped state.
  • The ECS instance is not associated with a public IP address or another EIP.
  • An ECS instance can be associated with only one EIP. If you want to associate multiple EIPs with an ECS instance, you can associate the EIPs with a secondary Elastic Network Interface (ENI). Then, you can associate the secondary ENI with the ECS instance. For more information, see Associate an ECS instance with multiple EIPs.

Limits on associating an EIP with a NAT gateway

Note the following limits before you associate an EIP with a NAT gateway:
  • No NAT bandwidth plan was purchased under the account to which the NAT gateway belongs before January 26, 2018.
  • The NAT gateway and the EIP must be deployed in the same region.
  • A NAT gateway can be associated with at most 20 EIPs.

    You can go to the Quota Management to increase the quota. For more information, see Quota management.

Limits on associating an EIP with an SLB instance

Note the following limits before you associate an EIP with a Server Load Balancer (SLB) instance:
  • The SLB instance must be deployed in a VPC network.
  • The SLB instance and the EIP must be deployed in the same region.
  • An SLB instance can be associated with only one EIP.

Limits on associating an EIP with a secondary ENI

Note the following limits before you associate an EIP with a secondary ENI:
  • The secondary ENI must be attached to a VPC network.
  • The secondary ENI and the EIP must be deployed in the same region.
  • You can associate an EIP with a secondary ENI in one of the following modes: NAT mode, cut-through mode, and multi-EIP to ENI mode.
    • In NAT mode, the number of EIPs with which a secondary ENI can be associated depends on the number of private IP addresses of the secondary ENI.
    • In cut-through mode, a secondary ENI can be associated with only one EIP.
    • In multi-EIP to ENI mode, a secondary ENI can be associated with at most 10 EIPs. To increase the quota, submit a ticket.