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Port 4024 (tnp1-port)

IANA assigns port 4024 to tnp1-port: TNP1 User Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tnp1-port TCP TNP1 User Port Tony Gibbs -
tnp1-port UDP TNP1 User Port Tony Gibbs -

Check what is listening on port 4024

Linux: is anything listening on TCP 4024?
sudo ss -tlnp 'sport = :4024'
Linux: UDP 4024
sudo ss -ulnp 'sport = :4024'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4024
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4024 '
Windows (Command Prompt)
netstat -ano | findstr :4024
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4024 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4024
From Windows
Test-NetConnection HOST -Port 4024
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4024

Block port 4024 in the firewall

ufw
sudo ufw deny 4024/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4024 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4024 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4024' -Direction Inbound -Protocol TCP -LocalPort 4024 -Action Block
ufw
sudo ufw deny 4024/udp
iptables
sudo iptables -A INPUT -p udp --dport 4024 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4024 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4024' -Direction Inbound -Protocol UDP -LocalPort 4024 -Action Block

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