How to work on a live WPMS blog when domain is unresolved? [closed]

Edit your computer’s hosts file, then on a new line, insert the IP address of the new or old server from which you’d want to access the site, followed by a space or tab, then type in the domain name (without http://). Here’s an example…

# This is an example of the hosts file
127.0.0.1  localhost loopback
::1        localhost
23.21.230.21 mydomain.com www.mydomain.com
23.21.230.21 subdomain1.mydomain.com subdomain2.mydomain.com
# None of the following will work as expected. Don't be disappointed!
# 23.21.230.21 mydomain.com www.mydomain.com subdomain1.mydomain.com
# 23.21.230.21 mydomain.com *.mydomain.com

Please replace 23.21.230.21 with the actual IP address of the server from which you’d want to access the site. You may also need to reopen the browsers after every change in this file.

I hope this answers your question.