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Port 584 (keyserver)

IANA assigns port 584 to keyserver: Key Server.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
keyserver TCP Key Server Gary Howland -
keyserver UDP Key Server Gary Howland -

Check what is listening on port 584

Linux: is anything listening on TCP 584?
sudo ss -tlnp 'sport = :584'
Linux: UDP 584
sudo ss -ulnp 'sport = :584'
Linux / macOS: which process owns the port
sudo lsof -nP -i :584
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':584 '
Windows (Command Prompt)
netstat -ano | findstr :584
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 584 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 584
From Windows
Test-NetConnection HOST -Port 584
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 584

Block port 584 in the firewall

ufw
sudo ufw deny 584/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 584 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 584 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 584' -Direction Inbound -Protocol TCP -LocalPort 584 -Action Block
ufw
sudo ufw deny 584/udp
iptables
sudo iptables -A INPUT -p udp --dport 584 -j DROP
nftables
sudo nft add rule inet filter input udp dport 584 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 584' -Direction Inbound -Protocol UDP -LocalPort 584 -Action Block

Related ports

582scc-security583philips-vc586password-chg587SMTP submission

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