Methods, apparatus, systems and articles of manufacture are disclosed to identify a first request, from a first device, the first request having a first source port number. Examples disclosed herein determine whether a second request, having a second source port number, is within a threshold number of ports from the first source port number. Examples disclosed herein group the first and the second requests as a first session when the second source port number is within the threshold number of ports from the first source port number, and identify an application associated with the first session when a user agent of the first request matches a first application pattern associated with the first application, the first application pattern including a wildcard in a location corresponding to a numerical value in the user agent.