macOS Services like cloudd, Mail, com.apple using IP Address 198.18.3.x

Hello, I've noticed that several macOS services such as cloudd, Mail and com.apple processes are using IP address range 198.18.3.x on my Mac. As far as I'm aware, 198.18.3.x network range is typically reserved for network interconnect device benchmark testing. I'm trying to understand if this is typical behavior for these services. Could someone with expertise clarify whether this IP is standard for internal macOS operations, or should I be concerned about potential security issues? Any guidance or information on what these connections signify would be greatly appreciated.