From WikiApiary, tracking Modern and over 3,200 other skins

Name: Modern (ID: 11831) Default skin image
Author(s): No authors provided.
Description: Modern is one of the skins which is bundled with MediaWiki by default. It is derived from the MonoBook skin. It was removed from MediaWiki Core in version 1.24 but recreated as an separate extension at the same time.
Related extensions: This skin has no related extensions.
Derived from: Skin:MonoBook
Website count: 13753 (74.18%) (Skipped on 150 sites.)
Websites using as default 237
Websites skipping it 150
Segments Day: 1 Hour: 23

Modern is default skin on websites:

Modern is an available skin on websites: