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Port 59 (any private file service)

IANA assigns port 59 to any private file service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
- TCP any private file service Jon Postel -
- UDP any private file service Jon Postel -

Check what is listening on port 59

Linux: is anything listening on TCP 59?
sudo ss -tlnp 'sport = :59'
Linux: UDP 59
sudo ss -ulnp 'sport = :59'
Linux / macOS: which process owns the port
sudo lsof -nP -i :59
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':59 '
Windows (Command Prompt)
netstat -ano | findstr :59
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 59 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 59
From Windows
Test-NetConnection HOST -Port 59
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 59

Block port 59 in the firewall

ufw
sudo ufw deny 59/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 59 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 59 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 59' -Direction Inbound -Protocol TCP -LocalPort 59 -Action Block
ufw
sudo ufw deny 59/udp
iptables
sudo iptables -A INPUT -p udp --dport 59 -j DROP
nftables
sudo nft add rule inet filter input udp dport 59 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 59' -Direction Inbound -Protocol UDP -LocalPort 59 -Action Block

Related ports

57any private terminal access58xns-mail62acas63whoispp, whois++

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