What is the narrator point of view in the poem, O Captain! My Captain!?

O Captain! My Captain! begins in first-person from the perspective of an unnamed speaker. In the second stanza, any mention of the speaker makes of himself in first-person disappears from the poem. Instead, the speaker addresses “O Captain! My Captain” in the second-person (9). In the final stanza of the poem, the speaker returns to using first-person.