What does the IP protection class say about a connector?

IP stands for International Protection or Ingress Protection.
The IP, in combination with the following codes, gives precise information about the external influences against which a product is protected. The national and international standards DIN EN 60529 and ISO 20653 define these combinations and the type of protection in the different IP classes.
Possible specifications can range from IP00 to IP69.
The first digit stands for the degree of protection of the housing against contact/foreign bodies.
The second digit stands for the degree of protection of the housing against moisture or ingress of water.

If one of the two digits is not specified according to the IP degree of protection, an “X” is used instead of the digits.