a valid aws bucket policy json format for S3 to handle access controll by IP addresses.

s3-bucket-policy.json

{
    "Version": "2008-10-17",
    "Id": "Policy<UNIQUE ID>",
    "Statement": [
        {
            "Sid": "Stmt<UNIQUE ID>",
            "Effect": "Deny",
            "Principal": {
                "AWS": "*"
            },
            "Action": "s3:*",
            "Resource": "arn:aws:s3:::<UNIQUE ID>/*",
            "Condition": {
                "NotIpAddress": {
                    "aws:SourceIp": [
                        "<IP ADDRESS>",
                        "..."
                    ]
                }
            }
        },
        {
            "Sid": "Stmt<UNIQUE ID>",
            "Effect": "Allow",
            "Principal": {
                "AWS": "*"
            },
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::<BUCKET NAME>/*",
            "Condition": {
                "IpAddress": {
                    "aws:SourceIp": [
                        "<IP ADDRESS>",
                        "..."
                    ]
                }
            }
        }
    ]
}