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Port 14142 (icpp)

IANA assigns port 14142 to icpp: IceWall Cert Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
icpp TCP IceWall Cert Protocol Tsutomu Fujinami -
icpp UDP IceWall Cert Protocol Tsutomu Fujinami -

Registry dates for this port: registered 2005-08.

Check what is listening on port 14142

Linux: is anything listening on TCP 14142?
sudo ss -tlnp 'sport = :14142'
Linux: UDP 14142
sudo ss -ulnp 'sport = :14142'
Linux / macOS: which process owns the port
sudo lsof -nP -i :14142
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':14142 '
Windows (Command Prompt)
netstat -ano | findstr :14142
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 14142 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 14142
From Windows
Test-NetConnection HOST -Port 14142
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 14142

Block port 14142 in the firewall

ufw
sudo ufw deny 14142/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 14142 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 14142 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 14142' -Direction Inbound -Protocol TCP -LocalPort 14142 -Action Block
ufw
sudo ufw deny 14142/udp
iptables
sudo iptables -A INPUT -p udp --dport 14142 -j DROP
nftables
sudo nft add rule inet filter input udp dport 14142 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 14142' -Direction Inbound -Protocol UDP -LocalPort 14142 -Action Block

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