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Port 22005 (optohost004)

IANA assigns port 22005 to optohost004: Opto Host Port 5.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
optohost004 TCP Opto Host Port 5 Doug Leany -
optohost004 UDP Opto Host Port 5 Doug Leany -

Registry dates for this port: registered 2006-09.

Check what is listening on port 22005

Linux: is anything listening on TCP 22005?
sudo ss -tlnp 'sport = :22005'
Linux: UDP 22005
sudo ss -ulnp 'sport = :22005'
Linux / macOS: which process owns the port
sudo lsof -nP -i :22005
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':22005 '
Windows (Command Prompt)
netstat -ano | findstr :22005
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22005 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 22005
From Windows
Test-NetConnection HOST -Port 22005
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 22005

Block port 22005 in the firewall

ufw
sudo ufw deny 22005/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 22005 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 22005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 22005' -Direction Inbound -Protocol TCP -LocalPort 22005 -Action Block
ufw
sudo ufw deny 22005/udp
iptables
sudo iptables -A INPUT -p udp --dport 22005 -j DROP
nftables
sudo nft add rule inet filter input udp dport 22005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 22005' -Direction Inbound -Protocol UDP -LocalPort 22005 -Action Block

Related ports

22004optohost00422003optohost00322125dcap22128gsidcap

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