A Pingback is one of three types of Linkbacks, methods for Web authors to request notification when somebody links to one of their documents.
https://en.wikipedia.org/wiki/Pingback
Syndication Techniques
Get access to data on 34,645,525 websites that are Pingback Support Customers. We know of 15,645,676 live websites using Pingback Support and an additional 18,999,849 sites that used Pingback Support historically and 1,900,955 websites in the United States.
Get a list of 34,645,525 websites using Pingback Support which includes location information, hosting data, contact details, 15,645,676 currently live websites and an additional 1,241,622 domains that redirect to sites in this list. 18,999,849 sites that used this technology previously and 1,900,955 websites in the United States currently using Pingback Support.
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