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Port 4017 (talarian-mcast3)

IANA assigns port 4017 to talarian-mcast3: Talarian Mcast.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
talarian-mcast3 TCP Talarian Mcast - -
talarian-mcast3 UDP Talarian Mcast - -

Check what is listening on port 4017

Linux: is anything listening on TCP 4017?
sudo ss -tlnp 'sport = :4017'
Linux: UDP 4017
sudo ss -ulnp 'sport = :4017'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4017
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4017 '
Windows (Command Prompt)
netstat -ano | findstr :4017
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4017 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4017
From Windows
Test-NetConnection HOST -Port 4017
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4017

Block port 4017 in the firewall

ufw
sudo ufw deny 4017/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4017 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4017 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4017' -Direction Inbound -Protocol TCP -LocalPort 4017 -Action Block
ufw
sudo ufw deny 4017/udp
iptables
sudo iptables -A INPUT -p udp --dport 4017 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4017 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4017' -Direction Inbound -Protocol UDP -LocalPort 4017 -Action Block

Related ports

4015talarian-mcast14016talarian-mcast24018talarian-mcast44019talarian-mcast5

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