Consul's DNS interface for service discovery; IANA registered it to EUROCONTROL's ASTERIX.
The IANA name for 8600 is asterix, EUROCONTROL's "Surveillance Data" format for exchanging radar and other ATM surveillance information, registered in 2005. What you meet on a normal network is Consul: its docs list 8600 as "The DNS server", answering queries like <service>.service.consul over both UDP and TCP. It runs on every Consul agent, so it usually appears next to 8500 on the same host. Because it is a DNS responder on a non-standard port, resolvers reach it only via a forwarding rule.
Expose with care
It answers unauthenticated queries that enumerate your internal services and their addresses. Keep it on a private interface and forward to it from your own resolver rather than publishing it.
$ dig @TARGET -p 8600 consul.service.consulSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.