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Port 25005 (icl-twobase6)

IANA assigns port 25005 to icl-twobase6.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
icl-twobase6 TCP icl-twobase6 J A Sever -
icl-twobase6 UDP icl-twobase6 J A Sever -

Check what is listening on port 25005

Linux: is anything listening on TCP 25005?
sudo ss -tlnp 'sport = :25005'
Linux: UDP 25005
sudo ss -ulnp 'sport = :25005'
Linux / macOS: which process owns the port
sudo lsof -nP -i :25005
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':25005 '
Windows (Command Prompt)
netstat -ano | findstr :25005
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 25005 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 25005
From Windows
Test-NetConnection HOST -Port 25005
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 25005

Block port 25005 in the firewall

ufw
sudo ufw deny 25005/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 25005 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 25005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 25005' -Direction Inbound -Protocol TCP -LocalPort 25005 -Action Block
ufw
sudo ufw deny 25005/udp
iptables
sudo iptables -A INPUT -p udp --dport 25005 -j DROP
nftables
sudo nft add rule inet filter input udp dport 25005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 25005' -Direction Inbound -Protocol UDP -LocalPort 25005 -Action Block

Related ports

25003icl-twobase425004icl-twobase525006icl-twobase725007icl-twobase8

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