How to correctly write .htaccess for maintenance mode? -

i know basics writing .htaccess handle maintenance mode page.

i don't want use plugin, need replace whole wp site while in maintenance mode.

i've tried add additional rules allows access wp back-end, specific ips.

i've tried several attempts , got close need.

however, want white-listed ip(s) able see front-end site, without being redirected maintenance page, i'm stuck there.

here's current .htaccess:

rewriteengine on  rewritecond %{request_uri} ^/images [or] rewritecond %{request_uri} ^/wp-admin/.* [or] rewritecond %{request_uri} ^/wp-content/.* [or] rewriterule .+ - [l]  rewritecond %{remote_addr} !^93\.62\.93\.79 rewritecond %{request_uri} !^/maintenance-mode\.html$ [nc] rewritecond %{request_uri} !\.(jpe?g?|png|gif) [nc] rewriterule .* /maintenance-mode.html [r=302,l] 

what i'm supposed add/change?

did found solution? don't tested wp worked me cms.

options +followsymlinks  rewriteengine on  # exclude file (otherwise infinity loop) rewritecond %{request_uri} !^/under-construction/maintenance\.php$ # exclude images , css rewritecond %{request_uri} !\.(jpe?g?|png|gif|css) [nc] # if it's not ip address rewritecond %{remote_host} !^111\.222\.333\.444$ # redirect /abc example.com/abc. rewriterule ^(.*)$ http://www.domain.com/under-construction/maintenance.php [r=307,l] 

perhaps you.