Anyone who deals with public DNS must have used NSLOOKUP Command Line Tool available in major Operating Systems. Google provides public DNS servers with IP Addresses 8.8.8.8 and 8.8.4.4 which we usually use to resolve a domain name and find value for the various type of DNS records. Traditional DNS queries and responses are sent over UDP or TCP. ![]() Google Public DNS Provides API https://dns.google.com/resolve? which can be used in Apps Script program with UrlFetchApp to fetch the results from Google Public DNS Server. Here is a sample code. var api_url = 'https://dns.google.com/resolve'; // Google Pubic DNS API Url var type = 'MX'; // Type of record to fetch, A, AAAA, MX, CNAME, TXT, ANY var name = 'sbctech.net'; // The domain name to lookup var requestUrl = api_url + '?name=' + name + '&type=' + type; // Build request URL var response = UrlFetchApp.fetch(requestUrl); // Fetch the reponse from API var responseText = response.getContentText(); // Get the response text var json = JSON.parse(responseText); // Parse the JSON text var answers = json.Answer.map(function(ans){return ans.data}).join('\n'); // Get the values Logger.log(answers); // Log the Values After running the above code. Values will be logged in the Logger. 5 alt1.aspmx.l.google.com. 5 alt2.aspmx.l.google.com. 10 alt3.aspmx.l.google.com. 1 aspmx.l.google.com. 10 alt4.aspmx.l.google.com. For more details on API, you can check the Google Documentation
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