# Policy Conditions

### Policy Conditions

In addition to controlling *which actions* users can perform, you can also control *under what circumstances* those actions are allowed. Policy conditions let you add extra requirements that must be met before access is granted.

#### IP Address Conditions

One of the most useful conditions is restricting access based on the client's IP address. This is ideal for:

* Limiting bucket access to your corporate network
* Ensuring backups only run from designated servers
* Meeting compliance requirements for data access controls

**IpAddress Condition**

The `IpAddress` condition allows access only when requests come from specified IP addresses or ranges:

```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "s3:*",
            "Resource": [
                "arn:aws:s3:::my-bucket",
                "arn:aws:s3:::my-bucket/*"
            ],
            "Condition": {
                "IpAddress": {
                    "aws:SourceIp": "203.0.113.0/24"
                }
            }
        }
    ]
}
```

This policy grants access only to requests originating from the 203.0.113.0/24 network.

**NotIpAddress Condition**

The `NotIpAddress` condition allows access from all IP addresses *except* those specified:

```json
"Condition": {
    "NotIpAddress": {
        "aws:SourceIp": "198.51.100.0/24"
    }
}
```

**Supported CIDR Ranges Examples**

IP addresses must be specified using CIDR notation:

* `/32` — Single IP (e.g., `203.0.113.25/32`)
* `/24` — Class C network (e.g., `203.0.113.0/24`)
* `/16` — Class B network (e.g., `203.0.0.0/16`)
* `/8` — Class A network (e.g., `203.0.0.0/8`)
* `/0` — All addresses (e.g., `0.0.0.0/0`)

For detailed examples and step-by-step instructions, see How to Restrict Bucket Access by IP Address.

***


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