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Port 487 (saft)

IANA assigns port 487 to saft: saft Simple Asynchronous File Transfer.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
saft TCP saft Simple Asynchronous File Transfer Ulli Horlacher -
saft UDP saft Simple Asynchronous File Transfer Ulli Horlacher -

Check what is listening on port 487

Linux: is anything listening on TCP 487?
sudo ss -tlnp 'sport = :487'
Linux: UDP 487
sudo ss -ulnp 'sport = :487'
Linux / macOS: which process owns the port
sudo lsof -nP -i :487
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':487 '
Windows (Command Prompt)
netstat -ano | findstr :487
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 487 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 487
From Windows
Test-NetConnection HOST -Port 487
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 487

Block port 487 in the firewall

ufw
sudo ufw deny 487/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 487 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 487 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 487' -Direction Inbound -Protocol TCP -LocalPort 487 -Action Block
ufw
sudo ufw deny 487/udp
iptables
sudo iptables -A INPUT -p udp --dport 487 -j DROP
nftables
sudo nft add rule inet filter input udp dport 487 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 487' -Direction Inbound -Protocol UDP -LocalPort 487 -Action Block

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