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Port 2866 (iwlistener)

IANA assigns port 2866 to iwlistener.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
iwlistener TCP iwlistener Fred Surr -
iwlistener UDP iwlistener Fred Surr -

Check what is listening on port 2866

Linux: is anything listening on TCP 2866?
sudo ss -tlnp 'sport = :2866'
Linux: UDP 2866
sudo ss -ulnp 'sport = :2866'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2866
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2866 '
Windows (Command Prompt)
netstat -ano | findstr :2866
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2866 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2866
From Windows
Test-NetConnection HOST -Port 2866
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2866

Block port 2866 in the firewall

ufw
sudo ufw deny 2866/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2866 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2866 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2866' -Direction Inbound -Protocol TCP -LocalPort 2866 -Action Block
ufw
sudo ufw deny 2866/udp
iptables
sudo iptables -A INPUT -p udp --dport 2866 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2866 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2866' -Direction Inbound -Protocol UDP -LocalPort 2866 -Action Block

Related ports

2864astronova-main2865pit-vpn2867esps-portal2868npep-messaging

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