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Port 366 (odmr)

IANA assigns port 366 to odmr: ODMR.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
odmr TCP ODMR Randall Gellens -
odmr UDP ODMR Randall Gellens -

Check what is listening on port 366

Linux: is anything listening on TCP 366?
sudo ss -tlnp 'sport = :366'
Linux: UDP 366
sudo ss -ulnp 'sport = :366'
Linux / macOS: which process owns the port
sudo lsof -nP -i :366
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':366 '
Windows (Command Prompt)
netstat -ano | findstr :366
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 366 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 366
From Windows
Test-NetConnection HOST -Port 366
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 366

Block port 366 in the firewall

ufw
sudo ufw deny 366/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 366 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 366 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 366' -Direction Inbound -Protocol TCP -LocalPort 366 -Action Block
ufw
sudo ufw deny 366/udp
iptables
sudo iptables -A INPUT -p udp --dport 366 -j DROP
nftables
sudo nft add rule inet filter input udp dport 366 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 366' -Direction Inbound -Protocol UDP -LocalPort 366 -Action Block

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