Get IP Address of the User using Apex #inSalesforce

Get IP Address of the User using Apex #inSalesforce

<apex:page controller="IPAddressController">
    Login IP Address is {!IPAddress}
</apex:page>

Class:

public class IPAddressController{
    public string IPAddress {get;set;}
    public IPAddressController() {
        IPAddress = ApexPages.currentPage().getHeaders().get('True-Client-IP');
        if (String.isBlank(IPAddress)) {
            IPAddress = ApexPages.currentPage().getHeaders().get('X-Salesforce-SIP');
        }  
        if (String.isBlank(IPAddress)) {
            IPAddress = ApexPages.currentPage().getHeaders().get('X-Forwarded-For');
        } 
    }
}