def describe_subnets(DryRun=None, SubnetIds=None, Filters=None):
    """
    Describes one or more of your subnets.
    For more information about subnets, see Your VPC and Subnets in the Amazon Virtual Private Cloud User Guide .
    See also: AWS API Documentation
    
    Examples
    This example describes the subnets for the specified VPC.
    Expected Output:
    
    :example: response = client.describe_subnets(
        DryRun=True|False,
        SubnetIds=[
            'string',
        ],
        Filters=[
            {
                'Name': 'string',
                'Values': [
                    'string',
                ]
            },
        ]
    )
    
    
    :type DryRun: boolean
    :param DryRun: Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation . Otherwise, it is UnauthorizedOperation .

    :type SubnetIds: list
    :param SubnetIds: One or more subnet IDs.
            Default: Describes all your subnets.
            (string) --
            

    :type Filters: list
    :param Filters: One or more filters.
            availabilityZone - The Availability Zone for the subnet. You can also use availability-zone as the filter name.
            available-ip-address-count - The number of IPv4 addresses in the subnet that are available.
            cidrBlock - The IPv4 CIDR block of the subnet. The CIDR block you specify must exactly match the subnet's CIDR block for information to be returned for the subnet. You can also use cidr or cidr-block as the filter names.
            defaultForAz - Indicates whether this is the default subnet for the Availability Zone. You can also use default-for-az as the filter name.
            ipv6-cidr-block-association.ipv6-cidr-block - An IPv6 CIDR block associated with the subnet.
            ipv6-cidr-block-association.association-id - An association ID for an IPv6 CIDR block associated with the subnet.
            ipv6-cidr-block-association.state - The state of an IPv6 CIDR block associated with the subnet.
            state - The state of the subnet (pending | available ).
            subnet-id - The ID of the subnet.
            tag :key =*value* - The key/value combination of a tag assigned to the resource. Specify the key of the tag in the filter name and the value of the tag in the filter value. For example, for the tag Purpose=X, specify tag:Purpose for the filter name and X for the filter value.
            tag-key - The key of a tag assigned to the resource. This filter is independent of the tag-value filter. For example, if you use both the filter 'tag-key=Purpose' and the filter 'tag-value=X', you get any resources assigned both the tag key Purpose (regardless of what the tag's value is), and the tag value X (regardless of what the tag's key is). If you want to list only resources where Purpose is X, see the tag :key =*value* filter.
            tag-value - The value of a tag assigned to the resource. This filter is independent of the tag-key filter.
            vpc-id - The ID of the VPC for the subnet.
            (dict) --A filter name and value pair that is used to return a more specific list of results. Filters can be used to match a set of resources by various criteria, such as tags, attributes, or IDs.
            Name (string) --The name of the filter. Filter names are case-sensitive.
            Values (list) --One or more filter values. Filter values are case-sensitive.
            (string) --
            
            

    :rtype: dict
    :return: {
        'Subnets': [
            {
                'SubnetId': 'string',
                'State': 'pending'|'available',
                'VpcId': 'string',
                'CidrBlock': 'string',
                'Ipv6CidrBlockAssociationSet': [
                    {
                        'Ipv6CidrBlock': 'string',
                        'Ipv6CidrBlockState': {
                            'State': 'associating'|'associated'|'disassociating'|'disassociated'|'failing'|'failed',
                            'StatusMessage': 'string'
                        },
                        'AssociationId': 'string'
                    },
                ],
                'AssignIpv6AddressOnCreation': True|False,
                'AvailableIpAddressCount': 123,
                'AvailabilityZone': 'string',
                'DefaultForAz': True|False,
                'MapPublicIpOnLaunch': True|False,
                'Tags': [
                    {
                        'Key': 'string',
                        'Value': 'string'
                    },
                ]
            },
        ]
    }
    
    
    """
    pass
