Which numbers can be shown on a number line?

A number line is a simple line having numbers marked on it to show various information associated with that point. In mathematics, the number system is the branch that deals with various types of numbers possible to form.
Types of numbers can be classified as:
Natural numbers, Whole numbers, Integers, Rational numbers, Irrational numbers, Real numbers and Imaginary numbers and Complex numbers.

We can see Natural numbers, Whole numbers, Integers, Rational numbers, Irrational numbers are a part of Real numbers. Fractions comes under Rational numbers.

Imaginary numbers are having $i=\sqrt{-1}$ which don't really exists but used in various fields of mathematics. Complex number is a combination of Real and imaginary numbers.

Irrational numbers come under the category of Real numbers. Their exact value is not known but mathematicians have developed some method like the arc method to represent irrational numbers on a number line.