Pinging a backlink is not typically necessary for search engines or tools like Moz to recognize it. Search engines, including Google, have sophisticated algorithms that automatically discover and index new content, including backlinks. They regularly crawl the web to update their databases.
However, if you've created a new backlink and want to expedite the indexing process, you can manually submit the URL to the Google Search Console. This can help Google discover and index the backlink faster.
As for Moz, their crawler, known as Rogerbot, operates independently of Google's indexing process. Moz will discover and update its index of backlinks during its own crawling and updating schedule. There's generally no need to ping backlinks explicitly for Moz to recognize them.
In summary, while pinging might not be necessary for Google or Moz to recognize a backlink, manually submitting the URL to the Google Search Console can be a proactive step to ensure quicker indexing by Google.