comment_author_IP( int|WP_Comment $comment_ID )

Displays the IP address of the author of the current comment.

Parameters

$comment_ID

(int|WP_Comment) (Optional) WP_Comment or the ID of the comment for which to print the author's IP address. Default current comment.

Source

File: wp-includes/comment-template.php 

function comment_author_IP( $comment_ID = 0 ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	echo esc_html( get_comment_author_IP( $comment_ID ) );
}

Uses

Uses Description
wp-includes/formatting.php: esc_html()

Escaping for HTML blocks.
wp-includes/comment-template.php: get_comment_author_IP()

Retrieve the IP address of the author of the current comment.

Changelog

Version Description
4.4.0 Added the ability for $comment_ID to also accept a WP_Comment object.
0.71 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/comment_author_ip