Sugestion

This plugin is great for keeping an eye on 404 errors and I often ban IP addresses based on this mod, One thing that I noticed that was missing was a way to quickly grab some more info regarding an IP address. (I prefer to double check before I ban)

I added a quick fix and will probably look into adding a popup link in the future to better suit my needs but I thought I would pass the suggestion along.

protected function column_ip( $item ){
		$ip = esc_html( $item->ip );	// don't use esc_url because it could be an invalid one that 404d
		return "<a href='http://www.infosniper.net/?ip_address=$ip' target='_blank'>$ip</a>";
    }

Thanks for the plugin

https://wordpress.org/plugins/404-error-logger/