# IpamPrefixListResolverVersion
<a name="API_IpamPrefixListResolverVersion"></a>

Describes a version of an IPAM prefix list resolver.

Each version is a snapshot of what CIDRs matched your rules at that moment in time. The version number increments every time the CIDR list changes due to infrastructure changes.

 **Version example:** 

 **Initial State (Version 1)** 

Production environment:
+ vpc-prod-web (10.1.0.0/16) - tagged env=prod
+ vpc-prod-db (10.2.0.0/16) - tagged env=prod

Resolver rule: Include all VPCs tagged env=prod

 **Version 1 CIDRs:** 10.1.0.0/16, 10.2.0.0/16

 **Infrastructure Change (Version 2)** 

New VPC added:
+ vpc-prod-api (10.3.0.0/16) - tagged env=prod

IPAM automatically detects the change and creates a new version.

 **Version 2 CIDRs:** 10.1.0.0/16, 10.2.0.0/16, 10.3.0.0/16

## Contents
<a name="API_IpamPrefixListResolverVersion_Contents"></a>

 ** version **   
The version number of the IPAM prefix list resolver.  
Each version is a snapshot of what CIDRs matched your rules at that moment in time. The version number increments every time the CIDR list changes due to infrastructure changes.  
Type: Long  
Required: No

## See Also
<a name="API_IpamPrefixListResolverVersion_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ec2-2016-11-15/IpamPrefixListResolverVersion) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/IpamPrefixListResolverVersion) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/IpamPrefixListResolverVersion)