User Agent String.Com 

User Agent String explained :

Opera 9.64
Opera	Name : Opera
9.64	Opera version
X11	X Window System a windowing system for bitmap displays
Linux x86_64	Operating System: Linux running on a Intel CPU running on a 64 bit processor
U	Security values: N for no security U for strong security I for weak security
hr	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) hr = Croatian
Presto	Layout engine for Opera
2.1.1	Presto version
First visit:	2009.04.05 09:04
Last visit:	2023.01.29 05:03
All Opera user agent strings