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Port 2289 (dict-lookup)

IANA assigns port 2289 to dict-lookup: Lookup dict server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dict-lookup TCP Lookup dict server William Fernando Mat -
dict-lookup UDP Lookup dict server William Fernando Mat -

Registry dates for this port: registered 2005-01.

Check what is listening on port 2289

Linux: is anything listening on TCP 2289?
sudo ss -tlnp 'sport = :2289'
Linux: UDP 2289
sudo ss -ulnp 'sport = :2289'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2289
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2289 '
Windows (Command Prompt)
netstat -ano | findstr :2289
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2289 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2289
From Windows
Test-NetConnection HOST -Port 2289
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2289

Block port 2289 in the firewall

ufw
sudo ufw deny 2289/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2289 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2289 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2289' -Direction Inbound -Protocol TCP -LocalPort 2289 -Action Block
ufw
sudo ufw deny 2289/udp
iptables
sudo iptables -A INPUT -p udp --dport 2289 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2289 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2289' -Direction Inbound -Protocol UDP -LocalPort 2289 -Action Block

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