How to identify unnatural links?

To gain benefit from the Google Penguin Update, we must have to identify the unnatural links. After that we need to fix the error or delete forever. In this case using tools to identify a potential unnatural link pattern is half the battle and personally or manually analyzing each link is the second half. I follow some step to prevent it. I hope you will be benefited from this.

Here are some steps to identifying Unnatural links:
At the beginning you need to download your back-link report from various sources or from various tools. My top priority and highly recommended sources are this:

1. Google Webmaster tools
2. Bing Webmaster tools
3. Majestic SEO and
4. Link Detox tool

In Majestic SEO, scrutinize back-links from domains with low citation and trust flow. Whilst in Link Detox, high, moderate and low risk back links are automatically flagged. The types of links that are likely culprits to a Penguin penalty are:

1. Spammy blog roll links

2. Link networks – private and public network
3. Comment spam
4. Classified spam
5. Forum signature spam with exact march
6. Article marketing links with signature spam at the bottom of articles
7. Free for all directories
8. Exact match anchor text ‘widget app’ links
9. Site wide back-links

List all the links and domains that fit the aloft contour and endeavor to get their acquaintance details.