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 34,788,626 websites Pingback Support Customers. We know of 14,420,621 live websites using Pingback Support and an additional 20,368,005 sites that used Pingback Support historically and 1,761,705 websites in the United States.
Get a list of 34,788,626 websites using Pingback Support which includes location information, hosting data, contact details, 14,420,621 currently live websites and an additional 1,015,516 domains that redirect to sites in this list. 20,368,005 sites that used this technology previouslyand 1,761,705 websites in the United States currently using Pingback Support.
Countries
Financial
Group
Region