Port 4019 (talarian-mcast5)

IANA assigns port 4019 to talarian-mcast5: Talarian Mcast.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

talarian-mcast5 TCP Talarian Mcast Geoff Mendal -

talarian-mcast5 UDP Talarian Mcast Geoff Mendal -

Linux: is anything listening on TCP 4019?

sudo ss -tlnp 'sport = :4019'

Linux: UDP 4019

sudo ss -ulnp 'sport = :4019'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4019

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4019 '

Windows (Command Prompt)

netstat -ano | findstr :4019

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4019 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4019

From Windows

Test-NetConnection HOST -Port 4019

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 4019

ufw

sudo ufw deny 4019/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4019 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4019 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4019' -Direction Inbound -Protocol TCP -LocalPort 4019 -Action Block

ufw

sudo ufw deny 4019/udp

iptables

sudo iptables -A INPUT -p udp --dport 4019 -j DROP

nftables

sudo nft add rule inet filter input udp dport 4019 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 4019' -Direction Inbound -Protocol UDP -LocalPort 4019 -Action Block

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