---
title: "IPAM configuration"
description: "IP address management global configuration"
product: "Calico Enterprise"
version: "3.21"
section: "Reference"
canonical_url: "https://docs.tigera.io/calico-enterprise/3.21/reference/resources/ipamconfig"
---

# IPAM configuration

An IPAM configuration resource (`IPAMConfiguration`) represents global IPAM configuration options.

## Sample YAML

```yaml
apiVersion: projectcalico.org/v3
kind: IPAMConfiguration
metadata:
  name: default
spec:
  strictAffinity: false
  maxBlocksPerHost: 4
```

## IPAM configuration definition

### Metadata

| Field | Description                                               | Accepted Values | Schema |
| ----- | --------------------------------------------------------- | --------------- | ------ |
| name  | Unique name to describe this resource instance. Required. | default         | string |

The resource is a singleton which must have the name `default`.

### Spec

| Field            | Description                                                         | Accepted Values | Schema | Default |
| ---------------- | ------------------------------------------------------------------- | --------------- | ------ | ------- |
| strictAffinity   | When StrictAffinity is true, borrowing IP addresses is not allowed. | true, false     | bool   | false   |
| maxBlocksPerHost | The max number of blocks that can be affine to each host.           | 0 - max(int32)  | int    | 20      |

## Supported operations

| Datastore type        | Create | Delete | Update | Get/List |
| --------------------- | ------ | ------ | ------ | -------- |
| etcdv3                | Yes    | Yes    | Yes    | Yes      |
| Kubernetes API server | Yes    | Yes    | Yes    | Yes      |