I installed Volumio on a Pi and plugged it into my Strict Isolation LAN segment; as soon as I did the firewall log started filling up with packets destined for OpenDNS. When I allowed access to OpenDNS the logs showed requests to all manner of servers, including:
$ whois 142.93.107.218 | grep -i organization
Organization: DigitalOcean, LLC (DO-13)
$ whois 198.55.111.50 | grep -i organization
Organization: QuadraNet Enterprises LLC (QEL-5)
$ whois 192.73.248.134 | grep -i organization
getaddrinfo(rwhois.as3236.net): Name or service not known
Organization: NetActuate, Inc (NETAC-4)
$ whois 173.71.69.215 | grep -i organization
Organization: MCI Communications Services, Inc. d/b/a Verizon Business (MCICS)
$ whois 199.180.133.100 | grep -i organization
Organization: Wowrack.com (WOWTEC-1)
Organization: Virpus (VIRPU-14)
$ whois 149.210.234.235 | grep -i organization
(No ‘Organization’ was returned on this one; the best identifier I see is “netname: TRANSIP-NL-AMS4-CUST”
$ whois 151.101.65.195 | grep -i organization
Organization: Fastly (SKYCA-3)
Why does Volumio need access to all of these servers?