How to find Port number of IP address?

Unfortunately the standard DNS A-record (domain name to IP address) used by web-browsers to locate web-servers does not include a port number. Web-browsers use the URL protocol prefix (http://) to determine the port number (http = 80, https = 443, ftp = 21, etc.) unless the port number is specifically typed in the URL (for example "http://www.simpledns.com:5000" = port 5000).

Can I specify a TCP/IP port number for my web-server in DNS? (Other than the standard port 80)

Quite an old question, but might be helpful to somebody in need.

If you know the url,

1. open the chrome browser,
2. open developer tools in chrome ,
3. Put the url in search bar and hit enter
4. look in network tab, you will see the ip and port both