- 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.
Port 270: Q-mode encapsulation for GIST messages
Port 270 is assigned by IANA to gist (Q-mode encapsulation for GIST messages).
270
How gist works
Other servicesThe client sends a request to port 270 and the gist service answers.
- Transport
- 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
Is port 270 dangerous?
We have no specific security note for port 270. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 270
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| gist | 270 | UDP | Q-mode encapsulation for GIST messages | RFC 5971 | - |
| - | 270 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 270, and is it reachable?
Linux
sudo ss -ltnup 'sport = :270' # process listening on 270
sudo lsof -nP -i :270macOS
sudo lsof -nP -i :270
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 270 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 270 netstat -ano | findstr :270
From another machine
nmap -p 270 -sV <host> sudo nmap -sU -p 270 <host> nc -zv <host> 270
Block it in the firewall
sudo ufw deny 270/udp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 270" -Direction Inbound -LocalPort 270 -Protocol UDP -Action Block # Windows
What is port 270 used for?
Port 270 is assigned by IANA to gist (Q-mode encapsulation for GIST messages).
Is port 270 TCP or UDP?
Port 270 is registered for UDP.
Is it safe to open port 270?
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 270 is open?
On Linux run "ss -ltnup 'sport = :270'", on macOS "lsof -nP -i :270", and on Windows "netstat -ano | findstr :270" to see the local process. From another machine, "nmap -p 270 <host>" shows whether it is reachable.
Other other services ports
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