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Port 1405 (ibm-res)

IANA assigns port 1405 to ibm-res: IBM Remote Execution Starter.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ibm-res TCP IBM Remote Execution Starter - -
ibm-res UDP IBM Remote Execution Starter - -

Check what is listening on port 1405

Linux: is anything listening on TCP 1405?
sudo ss -tlnp 'sport = :1405'
Linux: UDP 1405
sudo ss -ulnp 'sport = :1405'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1405
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1405 '
Windows (Command Prompt)
netstat -ano | findstr :1405
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1405 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1405
From Windows
Test-NetConnection HOST -Port 1405
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1405

Block port 1405 in the firewall

ufw
sudo ufw deny 1405/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1405 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1405 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1405' -Direction Inbound -Protocol TCP -LocalPort 1405 -Action Block
ufw
sudo ufw deny 1405/udp
iptables
sudo iptables -A INPUT -p udp --dport 1405 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1405 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1405' -Direction Inbound -Protocol UDP -LocalPort 1405 -Action Block

Related ports

1403prm-nm-np1404igi-lm1406netlabs-lm1407tibet-server

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.