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Why Does Moz Only Index Some Links?
From my experience, Moz might only index some links on a site due to several factors such as crawl budget, site structure, or content quality. I recently dealt with a similar issue on themepcobill.com.

Here’s how I approached and solved the problem:

Crawl Budget Optimization: Moz, like other search engines, allocates a specific crawl budget to each site. Ensuring that the most important pages are easily accessible and linked from the homepage helps in better indexing. For my site, I audited the internal linking structure to ensure that important pages weren't buried deep within the site.

Fixing Technical Issues: I used tools like Google Search Console and Moz’s Site Crawl to identify and fix technical issues such as broken links, duplicate content, and slow loading pages. Ensuring that the site's XML sitemap was up-to-date and submitted to Moz also helped improve crawl efficiency.

Quality Content: High-quality, unique content tends to get indexed more reliably. I reviewed the content on Mepco Bill Page to ensure it was engaging and provided value to visitors. Updating old content and adding new, relevant information also made a significant difference.

Backlink Profile: Having a strong backlink profile helps in better indexing. I worked on acquiring high-quality backlinks, which in turn improved its overall visibility and indexing rates on Moz.

By focusing on these key areas, I was able to significantly improve the number of pages Moz indexed from my site. Regular monitoring and adjustments are crucial to maintaining and further improving the indexing status.

If you’re facing similar issues, I recommend starting with a comprehensive audit of your site’s structure, content, and backlinks. Addressing these areas can greatly enhance Moz’s ability to index your site effectively.

I also see the same thing for the USA Blogger Book website. Our website has good reference source links but it is not shown while exploring or checking total links in Moz.
May be dealy for crawling or data not updated recently. Now just waiting to recrawl because there is no any other option.

@seogod123234 Moz Pro, like other SEO tools, has its own methods and algorithms for crawling and indexing backlinks. Here's an explanation of how Moz's backlink indexing works and why you might be seeing the discrepancies you mentioned:

How Moz Pro Crawls and Indexes Backlinks

1. Crawling Frequency and Depth:

   • Moz does not crawl the entire web as frequently or as deeply as search engines like Google. This means that it might not discover all the backlinks that exist.
   • High-authority sites (like those with DA 80+ you mentioned) may still not be crawled frequently if the specific pages where your backlinks exist are not high on Moz's priority list.

2. Link Discovery:

   • Moz prioritizes discovering links that are on pages it already knows about and considers important. EDU sites often fall into this category due to their high trust and authority, hence why your links from these sites are indexed more quickly.

3. Indexing Priorities:

   • Moz’s index might prioritize certain types of links. EDU sites generally have high trust, and links from these sites are considered high-quality, which could explain why Moz indexes them more reliably and quickly.

4. Link Verification and Quality:

   • Moz might have algorithms to verify the quality of links before indexing them. Links from user-generated content on high DA sites (like comments on GitHub or Pinterest) might be seen as less valuable compared to editorial links or contextual backlinks.

Reasons for Low Indexing Rate of High DA Site Links

• User-Generated Content: Links in user-generated content (e.g., comments) on high DA sites might be indexed less frequently.
• No-Follow Links: Many high DA sites apply a no-follow attribute to user-generated links, which may cause Moz to deemphasize or not index these links.
• Page Priority: Specific pages on high DA sites might not be considered important by Moz’s crawlers if they are deep in the site’s structure or receive low traffic.

How to Improve Backlink Indexing in Moz Pro

1. Submit URL for Crawling:

   • While Moz does not offer a direct way to submit URLs for crawling, you can use the Moz Link Explorer tool to analyze a URL, which might prompt Moz’s crawlers to check it.

2. Quality and Context of Backlinks:

   • Focus on acquiring backlinks that are within the main content of pages rather than in comments or user-generated sections. These are more likely to be indexed and valued by Moz.

3. Use Moz’s Link Intersect Tool:

   • This tool helps find sites that link to your competitors but not to you. Acquiring backlinks from these sites might increase the likelihood of them being indexed by Moz.

4. Diversify Backlink Sources:

   • Try to get backlinks from a variety of high-authority sites rather than relying heavily on user-generated content on a few high DA sites.

Understanding SEO Tool Limitations

• Third-Party Tools: Remember that Moz, Ahrefs, SEMrush, etc., are third-party tools with their own limitations and might not reflect real-time data as accurately as Google Search Console.
• Google Search Console: For the most accurate representation of your backlinks, use Google Search Console, as it shows the backlinks Google has discovered and indexed.

While there is no guaranteed way to force Moz to crawl specific pages, focusing on high-quality, diverse backlinks and utilizing Moz’s tools effectively can help improve the indexing rate of your backlinks.