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Port 16385 (rdgs)

IANA assigns port 16385 to rdgs: Reliable Datagram Sockets.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rdgs TCP Reliable Datagram Sockets Oracle 7 -

Registry dates for this port: registered 2015-04-30.

Check what is listening on port 16385

Linux: is anything listening on TCP 16385?
sudo ss -tlnp 'sport = :16385'
Linux / macOS: which process owns the port
sudo lsof -nP -i :16385
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':16385 '
Windows (Command Prompt)
netstat -ano | findstr :16385
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 16385 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 16385
From Windows
Test-NetConnection HOST -Port 16385

Block port 16385 in the firewall

ufw
sudo ufw deny 16385/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 16385 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 16385 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 16385' -Direction Inbound -Protocol TCP -LocalPort 16385 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.