x-pingback

A pingback is one of four types of linkback methods for Web authors to request notification when somebody links to one of their documents. This enables authors to keep track of who is linking to or referring to their articles

Header usage statistics

x-pingback response header information and usage statistics.

Websites using header x-pingback	3,696,769
Percentage of websites that use x-pingback header	4.58%
Total discovered header values	More than 10,000
Header uses directives	No
Header values are unique or random	No
Most popular in the country	United States