get_blogaddress_by_name( string $blogname )

function get_blogaddress_by_name( $blogname ) {
	if ( is_subdomain_install() ) {
		if ( $blogname == 'main' )
			$blogname = 'www';
		$url = rtrim( network_home_url(), '/' );
		if ( !empty( $blogname ) )
			$url = preg_replace( '|^([^\.]+://)|', "\${1}" . $blogname . '.', $url );
	} else {
		$url = network_home_url( $blogname );
	}
	return esc_url( $url . '/' );
}