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Port 586 (password-chg)

IANA assigns port 586 to password-chg: Password Change.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
password-chg TCP Password Change - -
password-chg UDP Password Change - -

Check what is listening on port 586

Linux: is anything listening on TCP 586?
sudo ss -tlnp 'sport = :586'
Linux: UDP 586
sudo ss -ulnp 'sport = :586'
Linux / macOS: which process owns the port
sudo lsof -nP -i :586
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':586 '
Windows (Command Prompt)
netstat -ano | findstr :586
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 586 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 586
From Windows
Test-NetConnection HOST -Port 586
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 586

Block port 586 in the firewall

ufw
sudo ufw deny 586/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 586 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 586 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 586' -Direction Inbound -Protocol TCP -LocalPort 586 -Action Block
ufw
sudo ufw deny 586/udp
iptables
sudo iptables -A INPUT -p udp --dport 586 -j DROP
nftables
sudo nft add rule inet filter input udp dport 586 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 586' -Direction Inbound -Protocol UDP -LocalPort 586 -Action Block

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