Your IP-Adress is:
In general a IP address is just an enumeration. For the sake of structuring it is seperated into groups (or partitions, ranges). This grouping can be most easily seen in the so called dot-notation, that consists currently of four and in the future of sixteen numbers.
A user agent is a description sent by the visitor’s browser or more generally client. It provides information of the kind of software used, such as browser type, browser version, operating system, and relevant extensions and tools, etc.
…more; and what is my user agent?