There are 40 shared CB channels used on a "take-turns" basis. There are no channels authorized in the CB Radio Service above 27.405 MHz or below 26.965 MHz.
No CB channel is assigned to any specific individual or organization. Be cooperative. Keep your communications short. Users must never talk with another station for more than 5 minutes continuously and then must wait at least one minute before starting another communication. Channel 9 is used only for emergency communications or for traveler assistance.