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Port 385 (ibm-app)

IANA assigns port 385 to ibm-app: IBM Application.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ibm-app TCP IBM Application Lisa Tomita -
ibm-app UDP IBM Application Lisa Tomita -

Check what is listening on port 385

Linux: is anything listening on TCP 385?
sudo ss -tlnp 'sport = :385'
Linux: UDP 385
sudo ss -ulnp 'sport = :385'
Linux / macOS: which process owns the port
sudo lsof -nP -i :385
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':385 '
Windows (Command Prompt)
netstat -ano | findstr :385
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 385 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 385
From Windows
Test-NetConnection HOST -Port 385
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 385

Block port 385 in the firewall

ufw
sudo ufw deny 385/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 385 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 385 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 385' -Direction Inbound -Protocol TCP -LocalPort 385 -Action Block
ufw
sudo ufw deny 385/udp
iptables
sudo iptables -A INPUT -p udp --dport 385 -j DROP
nftables
sudo nft add rule inet filter input udp dport 385 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 385' -Direction Inbound -Protocol UDP -LocalPort 385 -Action Block

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