The access log is used to record all of the visits to a site. Information is stored in the log for a month from the last site access.
More about apache access log and its structure - here.
Black list – information field, reports whether an address is in the blacklist. The access log has the ability to restrict access to the site from specific domain addresses and/or IP-addresses.
Black list is a .txt file, prepared in advance and stored in the Files section of Younicle. Each line of this file containing an IP-address for which access to the site will be denied. Then, in the access log at the bottom of the screen, click Select to select your custom blacklist file. This will open a window (see below). To cancel a blacklist, click Remove (on the bottom of the access log).
Custom black list selection
Blacklist should use IP-ranges in CIDR (Classless Inter-Domain Routing) format. More about CIDR - here.