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what is 198.41.0.10 // j.root-servers.net

my firewall reports it blocked access to
198.41.0.10 // 198.41.0.1 // 198.41.0.4
from it's outer interface to port 53.

These are reported as j.root-servers.net,
a.root-servers.net at network-solutions.inc

anyone knows what that means?
is it necessary?

kind regards, christian