Hi Kavitha,

Follow the steps below to update hard-coded references* in your org and your org's metadata (setup or customer code):
 
i. Create a new Force.com Project:
1. Go to File > New > Force.com Project
2. Provide a name for your project, enter your login credentials for the org, then click "Next.”
 
ii. Choose the project contents:
1. Select metadata components, then click "Choose."
2. On the next screen for metadata components, select the fields required then click "OK."
a. At a minimum, we suggest selecting the following: email templates, home page components, web links, workflow, triggers, classes, visualforce pages, and tabs.
3. Please keep in mind that you can only pull 1500 components at a time. If you need to pull more metadata, we recommend dividing your work into multiple projects.
a. If you exceed the limit for number of components, you will receive this error message: "LIMIT_EXCEEDED: Too many files retried in a single retrieve call, limit is 1500." The Metadata API, which the Force.com IDE uses to communicate with the server, enforces these limits per each deploy/retrieve transaction.
 
iii. Once you have created your project, press Ctrl-H to perform a search.
1. Search for the name of the instance that your org resides on, for example: NA4. See Figure 1 below.
a. If you have multiple projects open, right-click on each project you don't want to search on and choose "Close Project" or modify the search criteria so that you have a "working set" to minimize the files you're searching on.
b. If you need to access the server instance in your Visualforce page, you can use the following JavaScript function getServerInstance() to parse out the server instance from the URL:
            function getServerInstance()
                {
                    var URL = window.location + “”;
                    var urlParseArray = url.split(“.”);
                    var i;
                    for(i=0; i< urlParseArray.length; i++)
                    {
                    if(urlParseArray[i].indexOf(“salesforce”) != -1)
                        return urlParseArray[i-1];
                        if(urlParseArray[i].indexOf(“force”) != -1)
                        return urlParseArray[i-2]
                    }
                    return null;
                }
 
* These steps will remove hard-coded references from Visualforce Pages, home page components, web links, workflow, triggers, classes, and tabs. These steps will NOT remove hard-coded references from image URLs within email templates or Knowledge articles

https://help.salesforce.com/articleView?id=Updating-Hard-Coded-References-FAQ&type=1

Thanks,
Nagendra.