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Thanks Gaston for your comments! Hey Jim, First of all, apologies for the wrong timeframe, it was in fact updated on 8th January and the next expected update will be  February 26th. The Mozscape index, which powers Open Site Explorer, is still growing, and while it is large, our index doesn't cover the entire web. When we collect this data, we’re looking specifically for the most valuable links and, rather than crawling your entire site or every site, we collect this by starting our crawler on a few highest ranking sites and letting it perform a breadth first search to see what it finds. It is also possible that we found your links again, but that they did not meet our relevancy threshold and were excluded from the index. Because the Index is an automated process, there isn't one single 'technique' you can use to get picked up. The best thing you can do to help your links become re-indexed in OSE is to work on building links from sites with high Mozrank. We do recommend using a wide variety of backlink tools to get the most illustrative picture of how your site's backlink profile looks, as Gaston mentioned. OSE and Ahrefs index differently and have different purposes. Ahrefs is good for quantity while OSE is great for finding higher quality links. You can read more about how we build our index in our guide here. On a positive note we do have plans in the works to improve and broaden out the data we have in the index, keep an eye out! I hope this helps - let me know if you have any further questions! Eli