Strange URL request

Hi,

I have been getting many 404 pages not found in the system logs showing the message below.

Error 404. The requested page (/.well-known/carddav) was not found

I have no idea if it as an attempted prob by a bot or a url resolve, can anybody shed some light, please?

Paul.

bots/hackers looking for known vulnerable sites.  nopCommerce has none (known ;)