public java.util.List<String> getCustomDnsServers() {
        if (customDnsServers == null) {
            customDnsServers = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return customDnsServers;
    }
<p>
The IPv4 address range, in CIDR notation, of the DNS servers to be used. You can specify up to two DNS servers.
Ensure that the DNS servers can be reached by the clients. The specified values overwrite the existing values.
</p>

@return The IPv4 address range, in CIDR notation, of the DNS servers to be used. You can specify up to two DNS
        servers. Ensure that the DNS servers can be reached by the clients. The specified values overwrite the
        existing values.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/DnsServersOptionsModifyStructure.java