Directories need the execute bit set, or programs won't be able to list the directory's contents. The execute bit means something entirely different when it's applied to directories. You can find dozens of discussions about Unix permissions from a Google search.
drw-r--r-- 5 syslog syslog 4096 Apr 1 02:00 192.168.1.1
drw-r--r-- 3 syslog syslog 4096 Jan 2 05:58 192.168.1.2
drw-r--r-- 3 syslog syslog 4096 Jan 2 05:58 192.168.1.3
You should reset the permissions to 755 with chmod, e.g.,
will make all directories whose names start with "192" have the correct permissions. If you want to prohibit anyone other than root and the syslog pseudo-user to view those logs, use 750 instead of 755.
chmod 755 192*
You might want to look into why those directories have the wrong permissions. By default new directories get 755 permissions. So either you or someone you work with accidentally removed the execute bit from the directories on April 9th.