Well there's over 300 people on rn, and I'm able to connect without any issues; try flushing your DNS cache (google it) and make sure you're using a regular 1.8.9 MC client to join.
I flushed them and started up a new 1.8.9 folder and it still says that I cannot connect to the server. When I try joining, here is what it says: https://prnt.sc/gug55q the same message appears when I try to direct connect as well.
In that case it must be an issue with your ISP or router configuration (or maybe even the standards of the country you live in) - You need to make sure your connection is capable of resolving an SRV record; although most home broadband connections are already configured to handle SRV records, yours might not - contact your ISP for help and advice on enabling this feature (I can't do much else to help you, sorry).
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