Resource utilization metrics - Amazon Virtual Private Cloud
VPC metricsSubnet metricsPublic IPv4 pool metricsPublic IP insight metricsQuick tip
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Resource utilization metrics

IPAM publishes IP utilization metrics for resources that the IPAM monitors to Amazon CloudWatch. These resources include:

  • VPCs (IPv4 and IPv6)

  • Subnets (IPv4)

  • Public IPv4 pools

IPAM calculates and publishes IP utilization metrics separately by IP address family (IPv4 or IPv6). The IP utilization of a resource is calculated across all of its CIDRs of the same address family.

For each resource type and address family combination, IPAM uses three rules to determine which metrics to publish:

  • Up to 50 resources with the highest IP utilization. You can use this information to configure alarms to be alerted if an IP utilization threshold is breached.

  • Up to 50 resources with the lowest IP utilization. You can use this information to decide if you want to keep or delete resources that are underutilized.

  • Up to 50 other resources. You can use this information to consistently track the IP utilization of resources that may not be captured within the high or low utilization group.

    • Up to 50 VPCs containing a CIDR allocated from an IPAM pool (prioritized by total size of CIDR blocks).

    • Up to 50 subnets whose VPC contains a CIDR allocated from an IPAM pool (prioritized by total size of CIDR blocks).

    • Up to 50 public IPv4 pools containing a CIDR allocated from an IPAM pool (prioritized by total size of CIDR blocks).

After applying each rule, the metrics are aggregated and published under the same metric name for each resource type. See below for detailed information on the metric names and their dimensions.

Important

There is a unique limit for each resource type, address family, and rule combination. The default value of each limit is 50. You can adjust these limits by contacting the Amazon Support Center as described in Amazon service quotas in the Amazon Web Services General Reference.

Example

Let’s say that your IPAM monitors 2,500 VPCs and 10,000 subnets, all with IPv4 and IPv6 CIDRs. IPAM publishes the following IP utilization metrics:

  • Up to 150 metrics for VPC IPv4 IP utilization, including:

    • The 50 VPCs with the highest IPv4 IP utilization

    • The 50 VPCs with the lowest IPv4 utilization

    • Up to 50 VPCs containing an IPv4 CIDR allocated from an IPAM pool

  • Up to 150 metrics for VPC IPv6 utilization, including:

    • The 50 VPCs with the highest IPv6 IP utilization

    • The 50 VPCs with the lowest IPv6 utilization

    • Up to 50 VPCs containing an IPv6 CIDR allocated from an IPAM pool

  • Up to 150 metrics for subnet IPv4 utilization, including:

    • The 50 subnets with the highest IPv4 IP utilization

    • The 50 subnets with the lowest IPv4 IP utilization

    • Up to 50 subnets whose VPC contains an IPv4 CIDR allocated from an IPAM pool

VPC metrics

The VPC metric name and description is listed below.

Metric name Description
VpcIPUsage The total IPs covered by CIDRs in the VPC’s subnets divided by the total IPs covered by CIDRs in the VPC. This is calculated across all VPC CIDRs in the same IPAM Scope and separately for IPv4 and IPv6 CIDRs.

The dimensions you can use to filter VPC metrics are listed below.

Dimension Description
AddressFamily The IP address family for resource CIDRs (IPv4 or IPv6).
OwnerID The ID of the VPC owner.
Region The Amazon Region where the VPC is located.
ScopeID The ID of the IPAM scope that the VPC belongs to.
VpcID The ID of the VPC.

Subnet metrics

The subnet metric name and description is listed below.

Metric name Description
SubnetIPUsage The number of active IPs divided by total IPs in the subnet's IPv4 CIDR.

The dimensions you can use to filter subnet metrics are listed below.

Dimension Description
AddressFamily The IP address family for resource CIDRs (IPv4 only).
OwnerID The ID of the subnet owner.
Region The Amazon Region where the subnet is located.
ScopeID The ID of the IPAM scope that the subnet belongs to.
SubnetID The ID of the subnet.
VpcID The ID of the VPC that the subnet belongs to.

Public IPv4 pool metrics

The public IPv4 pool metric name and description is listed below.

Metric name Description
PublicIPv4PoolIPUsage The number of EIPs from the public IPv4 Pool divided by total IPs in the pool.

The dimensions you can use to filter the public IPv4 pool metrics are listed below.

Dimension Description
OwnerID The ID of the public IPv4 pool owner.
PublicIPv4PoolID The ID of the public IPv4 pool.
Region The Amazon Region where the public IPv4 pool is located.
ScopeID The ID of the IPAM scope that the public IPv4 pool belongs to.

Public IP insight metrics

The public IP insight metric names and descriptions are listed below.

Metric name Description
AmazonOwnedElasticIPs The number of Amazon-owned Elastic IP addresses that you have provisioned or assigned to resources in your Amazon account.
AssociatedAmazonOwnedElasticIPs The number of Amazon-owned Elastic IP addresses that you have associated with resources in your Amazon account.
AssociatedBringYourOwnIPs The number of public IPv4 addresses that you have brought to Amazon using Bring your own IP addresses (BYOIP) and have associated with resources in your Amazon account.
BringYourOwnIPs The number of public IPv4 addresses that you have brought to Amazon using Bring your own IP addresses (BYOIP).
EC2PublicIPs The number of public IPv4 addresses assigned to EC2 instances when the instances were launched into a default subnet or into a subnet configured to automatically assign a public IPv4 address.
ServiceManagedBringYourOwnIPs The number of public IPv4 addresses that you have brought to Amazon using Bring your own IP addresses (BYOIP) that are provisioned and managed by an Amazon service.
ServiceManagedIPs The number of public IPv4 addresses provisioned and managed by an Amazon service.
UnassociatedAmazonOwnedElasticIPs The number of Amazon-owned Elastic IP addresses that you have not associated with resources in your Amazon account.
UnassociatedBringYourOwnIPs The number of public IPv4 addresses that you have brought to Amazon using Bring your own IP addresses (BYOIP) and have not associated with any resources in your Amazon account.

The dimensions you can use to filter the public IP insight metrics are listed below.

Dimension Description
IpamId The ID of the IPAM that the IP address belongs to.
Region The Amazon Region where the public IP address is located.

Quick tip for creating alarms

To quickly create an Amazon CloudWatch alarm for resources with high IP address utilization, open the CloudWatch console, choose Metrics, All metrics, choose the Query tab, choose the Namespace AWS/IPAM > VPC IP Usage Metrics, AWS/IPAM > Subnet IP Usage Metrics, or AWS/IPAM > Public IPv4 Pool IP Usage Metrics, choose the Metric name MAX(VpcIPUsage), MAX(SubnetIPUsage), or MAX(PublicIPv4PoolIPUsage), and choose Create alarm. For more information, see Create alarms on Metrics Insights queries in the Amazon CloudWatch User Guide.