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Port 117 (uucp-path)

IANA assigns port 117 to uucp-path: UUCP Path Service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
uucp-path TCP UUCP Path Service - -
uucp-path UDP UUCP Path Service - -

Check what is listening on port 117

Linux: is anything listening on TCP 117?
sudo ss -tlnp 'sport = :117'
Linux: UDP 117
sudo ss -ulnp 'sport = :117'
Linux / macOS: which process owns the port
sudo lsof -nP -i :117
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':117 '
Windows (Command Prompt)
netstat -ano | findstr :117
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 117 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 117
From Windows
Test-NetConnection HOST -Port 117
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 117

Block port 117 in the firewall

ufw
sudo ufw deny 117/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 117 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 117 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 117' -Direction Inbound -Protocol TCP -LocalPort 117 -Action Block
ufw
sudo ufw deny 117/udp
iptables
sudo iptables -A INPUT -p udp --dport 117 -j DROP
nftables
sudo nft add rule inet filter input udp dport 117 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 117' -Direction Inbound -Protocol UDP -LocalPort 117 -Action Block

Related ports

115sftp116ansanotify118sqlserv119NNTP

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