Latest CentOS 4 user agents:

User Agent Browser Device
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.0.14eol) Gecko/20120628 CentOS/1.0.9-40.el4.centos SeaMonkey/1.0.9 Unknown Unknown
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070719 CentOS/1.5.0.12-0.3.el4.centos Firefox/52.5.0 Firefox 52 Unknown
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.10) Gecko/20070223 CentOS/1.5.0.10-0.1.el4.centos Firefox/52.0 Firefox 52 Unknown
Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.0.5) Gecko/20060805 CentOS/1.0.3-0.el4.1.centos4 SeaMonkey/1.0.3 Unknown Unknown
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.10) Gecko/20070223 CentOS/1.5.0.10-0.1.el4.centos Firefox/1.5.0.10 Firefox 1 Unknown
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.5) Gecko/2008122014 CentOS/3.0.5-1.el4.centos Firefox/3.0.5 Firefox 3 Unknown
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.0.12) Gecko/20080419 CentOS/1.5.0.12-0.15.el4.centos Firefox/1.5.0.12 pango-text Firefox 1 Unknown
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070719 CentOS/1.5.0.12-0.3.el4.centos Firefox/1.5.0.12 Firefox 1 Unknown