ipアドレスで閲覧制限(前にも書いたはずなのだが・・・)

 #.htaccessへの記述
# 2.2系以前のApache
 order deny,allow
 deny from all
 allow from 123.45.67.87
 allow from 123.45.67.88
 allow from 123.45.67.89
 #.htaccessへの記述
# 2.4系以降のApache
Require all denied
Require ip 123.45.67.87
Require ip 123.45.67.88
Require ip 123.45.67.89