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Port 580 (sntp-heartbeat)

IANA assigns port 580 to sntp-heartbeat: SNTP HEARTBEAT.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
sntp-heartbeat TCP SNTP HEARTBEAT Louis Mamakos 2 -
sntp-heartbeat UDP SNTP HEARTBEAT Louis Mamakos 2 -

Check what is listening on port 580

Linux: is anything listening on TCP 580?
sudo ss -tlnp 'sport = :580'
Linux: UDP 580
sudo ss -ulnp 'sport = :580'
Linux / macOS: which process owns the port
sudo lsof -nP -i :580
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':580 '
Windows (Command Prompt)
netstat -ano | findstr :580
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 580 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 580
From Windows
Test-NetConnection HOST -Port 580
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 580

Block port 580 in the firewall

ufw
sudo ufw deny 580/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 580 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 580 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 580' -Direction Inbound -Protocol TCP -LocalPort 580 -Action Block
ufw
sudo ufw deny 580/udp
iptables
sudo iptables -A INPUT -p udp --dport 580 -j DROP
nftables
sudo nft add rule inet filter input udp dport 580 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 580' -Direction Inbound -Protocol UDP -LocalPort 580 -Action Block

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