User Agent String.Com 

User Agent String explained :

Opera 9.99
Opera	Name : Opera
9.99	Opera version
X11	X Window System a windowing system for bitmap displays
U	Security values: N for no security U for strong security I for weak security
sk	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) sk = Slovak
First visit:	2011.10.28 07:34
Last visit:	2019.07.08 10:41
All Opera user agent strings