3C is the first radio source catalog published in 1950 by the Cambridge University.

4C is the radio source catalog published in 1965 by the Cambridge University.

5C is the radio source catalog published in 1970 by the Cambridge University.

6C is the radio source catalog published in 1974 by the Cambridge University.

7C is the radio source catalog published in 1983 by the Cambridge University.

8C is the radio source catalog published in 1988 by the Cambridge University.

9C is the radio source catalog published in 1993 by the Cambridge University.

10C is the radio source catalog published in 1998 by the Cambridge University.

11C is the radio source catalog published in 2003 by the Cambridge University.

12C is the radio source catalog published in 2008 by the Cambridge University.

13C is the radio source catalog published in 2013 by the Cambridge University.

14C is the radio source catalog published in 2018 by the Cambridge University.

15C is the radio source catalog published in 2023 by the Cambridge University.

16C is the radio source catalog published in 2028 by the Cambridge University.

17C is the radio source catalog published in 2033 by the Cambridge University.