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Port 4018 (talarian-mcast4)

IANA assigns port 4018 to talarian-mcast4: Talarian Mcast.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
talarian-mcast4 TCP Talarian Mcast - -
talarian-mcast4 UDP Talarian Mcast - -

Check what is listening on port 4018

Linux: is anything listening on TCP 4018?
sudo ss -tlnp 'sport = :4018'
Linux: UDP 4018
sudo ss -ulnp 'sport = :4018'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4018
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4018 '
Windows (Command Prompt)
netstat -ano | findstr :4018
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4018 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4018
From Windows
Test-NetConnection HOST -Port 4018
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4018

Block port 4018 in the firewall

ufw
sudo ufw deny 4018/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4018 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4018 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4018' -Direction Inbound -Protocol TCP -LocalPort 4018 -Action Block
ufw
sudo ufw deny 4018/udp
iptables
sudo iptables -A INPUT -p udp --dport 4018 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4018 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4018' -Direction Inbound -Protocol UDP -LocalPort 4018 -Action Block

Related ports

4016talarian-mcast24017talarian-mcast34019talarian-mcast54020trap

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