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Amazon Web Service (AWS)

Elastic IP

An Elastic IP (EIP) is a public and static IPv4 address that is reachable from the internet and replaces the default public IP address of your EC2 instance. An Elastic IP address is allocated to your AWS account, and it’s yours until you release it. Its main purpose is to mask a failure of your EC2 instance or application by remapping the IP address to another instance within your account.
Elastic IP charges a fee for each Elastic IP address associated with a running instance, with a fee for each hour the IP address is not associated with a running instance. There is no additional charge for using Elastic IPs with EC2 instances, but charges may apply for data transfer. The cost of using Elastic IPs depends on the number of IP addresses associated with running instances and the amount of data transferred.
Direct Cost


Indirect Cost
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Terraform Name
Elastic IP
  • address - (Optional) IP address from an EC2 BYOIP pool. This option is only available for VPC EIPs.
  • associate_with_private_ip - (Optional) User-specified primary or secondary private IP address to associate with the Elastic IP address. If no private IP address is specified, the Elastic IP address is associated with the primary private IP address.
  • customer_owned_ipv4_pool - (Optional) ID of a customer-owned address pool. For more on customer owned IP addressed check out Customer-owned IP addresses guide.
  • instance - (Optional) EC2 instance ID.
  • network_border_group - (Optional) Location from which the IP address is advertised. Use this parameter to limit the address to this location.
  • network_interface - (Optional) Network interface ID to associate with.
  • public_ipv4_pool - (Optional) EC2 IPv4 address pool identifier or amazon. This option is only available for VPC EIPs.
  • tags - (Optional) Map of tags to assign to the resource. Tags can only be applied to EIPs in a VPC. If configured with a provider default_tags configuration block present, tags with matching keys will overwrite those defined at the provider-level.
  • vpc - (Optional) Boolean if the EIP is in a VPC or not. Defaults to true unless the region supports EC2-Classic.

Associating resources with a
Elastic IP
Resources do not "belong" to a
Elastic IP
Rather, one or more Security Groups are associated to a resource.
Elastic IP
via Terraform:
The following HCL associates an instance with a single Elastic IP

resource "aws_eip" "lb" {
 instance =
 vpc      = true

Elastic IP
via CLI:

[--domain <value>]
[--address <value>]
[--public-ipv4-pool <value>]
[--network-border-group <value>]
[--customer-owned-ipv4-pool <value>]
[--dry-run | --no-dry-run]
[--tag-specifications <value>]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--endpoint-url <value>]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]

Best Practices for
Elastic IP

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