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 34,373,856 websites that are Pingback Support Customers. We know of 14,158,304 live websites using Pingback Support and an additional 20,215,552 sites that used Pingback Support historically and 1,858,840 websites in the United States.
Get a list of 34,373,856 websites using Pingback Support which includes location information, hosting data, contact details, 14,158,304 currently live websites and an additional 1,114,255 domains that redirect to sites in this list. 20,215,552 sites that used this technology previously and 1,858,840 websites in the United States currently using Pingback Support.
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