https://www.cpan.org/SITES.html:

"For many years, CPAN benefitted from the mirroring of the central respository to many sites around the world. In the time of a slower global Internet, these mirrors provided most Perl users with fast access to thousands of software distributions. These days, the CPAN is backed by a CDN that performs the same job, but transparently. There is no longer a list of registered mirrors, you can just point at www.cpan.org and go."

just use https://www.cpan.org/.