<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} (.*)?/login(.*)?$ [OR]
RewriteCond %{REQUEST_URI} (.*)?/admin(.*)?$
RewriteCond %{REMOTE_ADDR} !^000\.000\.000\.000$　←自分のIP
RewriteRule ^.*$ - [F]
</IfModule>