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Port 2989 (zarkov)

IANA assigns port 2989 to zarkov: ZARKOV Intelligent Agent Communication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
zarkov TCP ZARKOV Intelligent Agent Communication Robin Felix -
zarkov UDP ZARKOV Intelligent Agent Communication Robin Felix -

Registry dates for this port: last modified 2014-02-17.

Check what is listening on port 2989

Linux: is anything listening on TCP 2989?
sudo ss -tlnp 'sport = :2989'
Linux: UDP 2989
sudo ss -ulnp 'sport = :2989'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2989
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2989 '
Windows (Command Prompt)
netstat -ano | findstr :2989
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2989 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2989
From Windows
Test-NetConnection HOST -Port 2989
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2989

Block port 2989 in the firewall

ufw
sudo ufw deny 2989/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2989 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2989 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2989' -Direction Inbound -Protocol TCP -LocalPort 2989 -Action Block
ufw
sudo ufw deny 2989/udp
iptables
sudo iptables -A INPUT -p udp --dport 2989 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2989 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2989' -Direction Inbound -Protocol UDP -LocalPort 2989 -Action Block

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