CyberHunter
Local dataset, no network
// Other services

Port 70: Gopher

Port 70 is assigned by IANA to gopher (Gopher).

70

How gopher works

Other services
client:70gopherresponse client:70gopherresponse

The client sends a request to port 70 and the gopher service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 70 dangerous?

We have no specific security note for port 70. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 70

ServicePortTransportDescriptionReferenceUpdated
gopher 70 TCP, UDP Gopher - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 70, and is it reachable?

Linux

sudo ss -ltnup 'sport = :70'      # process listening on 70
sudo lsof -nP -i :70

macOS

sudo lsof -nP -i :70

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 70 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 70
netstat -ano | findstr :70

From another machine

nmap -p 70 -sV <host>
sudo nmap -sU -p 70 <host>
nc -zv <host> 70

Block it in the firewall

sudo ufw deny 70/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 70" -Direction Inbound -LocalPort 70 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 70 used for?

Port 70 is assigned by IANA to gopher (Gopher).

Is port 70 TCP or UDP?

Port 70 is registered for TCP and UDP.

Is it safe to open port 70?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 70 is open?

On Linux run "ss -ltnup 'sport = :70'", on macOS "lsof -nP -i :70", and on Windows "netstat -ano | findstr :70" to see the local process. From another machine, "nmap -p 70 <host>" shows whether it is reachable.

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