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Port 22305 (cis)

IANA assigns port 22305 to cis: CompactIS Tunnel.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cis TCP CompactIS Tunnel Justin Paupore -
cis UDP CompactIS Tunnel Justin Paupore -

Registry dates for this port: registered 2007-08-16.

Check what is listening on port 22305

Linux: is anything listening on TCP 22305?
sudo ss -tlnp 'sport = :22305'
Linux: UDP 22305
sudo ss -ulnp 'sport = :22305'
Linux / macOS: which process owns the port
sudo lsof -nP -i :22305
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':22305 '
Windows (Command Prompt)
netstat -ano | findstr :22305
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22305 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 22305
From Windows
Test-NetConnection HOST -Port 22305
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 22305

Block port 22305 in the firewall

ufw
sudo ufw deny 22305/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 22305 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 22305 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 22305' -Direction Inbound -Protocol TCP -LocalPort 22305 -Action Block
ufw
sudo ufw deny 22305/udp
iptables
sudo iptables -A INPUT -p udp --dport 22305 -j DROP
nftables
sudo nft add rule inet filter input udp dport 22305 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 22305' -Direction Inbound -Protocol UDP -LocalPort 22305 -Action Block

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