CyberHunter
Local dataset, no network
// Other services

Port 3270: Verismart

Port 3270 is assigned by IANA to verismart (Verismart).

3270

How verismart works

Other services
client:3270verismartresponse client:3270verismartresponse

The client sends a request to port 3270 and the verismart 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 3270 dangerous?

We have no specific security note for port 3270. 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 3270

ServicePortTransportDescriptionReferenceUpdated
verismart 3270 TCP, UDP Verismart - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3270, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3270'      # process listening on 3270
sudo lsof -nP -i :3270

macOS

sudo lsof -nP -i :3270

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3270 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3270
netstat -ano | findstr :3270

From another machine

nmap -p 3270 -sV <host>
sudo nmap -sU -p 3270 <host>
nc -zv <host> 3270

Block it in the firewall

sudo ufw deny 3270/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3270" -Direction Inbound -LocalPort 3270 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3270 used for?

Port 3270 is assigned by IANA to verismart (Verismart).

Is port 3270 TCP or UDP?

Port 3270 is registered for TCP and UDP.

Is it safe to open port 3270?

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 3270 is open?

On Linux run "ss -ltnup 'sport = :3270'", on macOS "lsof -nP -i :3270", and on Windows "netstat -ano | findstr :3270" to see the local process. From another machine, "nmap -p 3270 <host>" shows whether it is reachable.

05 Related
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