Belonging to it.

Misspelling of it's.

The one (or ones) belonging to it.

plural of it

(computing) Initialism of issue tracking system. / (transport) Initialism of intelligent transportation system.

Misspelling of its.

plural of 'it

(sometimes derogatory) Used to form nouns denoting followers or adherents of a specified person, idea, doctrine, movement, etc.

Forms adjectives.

(medicine) Initialism of in the ear.