HTTPfy

Port 79 (finger)

IANA assigns port 79 to finger: Finger.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
finger TCP Finger David Zimmerman -
finger UDP Finger David Zimmerman -

Check what is listening on port 79

Linux: is anything listening on TCP 79?
sudo ss -tlnp 'sport = :79'
Linux: UDP 79
sudo ss -ulnp 'sport = :79'
Linux / macOS: which process owns the port
sudo lsof -nP -i :79
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':79 '
Windows (Command Prompt)
netstat -ano | findstr :79
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 79 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 79
From Windows
Test-NetConnection HOST -Port 79
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 79

Block port 79 in the firewall

ufw
sudo ufw deny 79/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 79 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 79 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 79' -Direction Inbound -Protocol TCP -LocalPort 79 -Action Block
ufw
sudo ufw deny 79/udp
iptables
sudo iptables -A INPUT -p udp --dport 79 -j DROP
nftables
sudo nft add rule inet filter input udp dport 79 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 79' -Direction Inbound -Protocol UDP -LocalPort 79 -Action Block

Related ports

77any private RJE service78vettcp80HTTP82xfer

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