CyberHunter
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// Other services

Port 2387: VSAM Redirector

Port 2387 is assigned by IANA to vsamredirector (VSAM Redirector).

2387

How vsamredirector works

Other services
client:2387vsamredirectorresponse client:2387vsamredirectorresponse

The client sends a request to port 2387 and the vsamredirector 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 2387 dangerous?

We have no specific security note for port 2387. 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 2387

ServicePortTransportDescriptionReferenceUpdated
vsamredirector 2387 TCP, UDP VSAM Redirector - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2387, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2387'      # process listening on 2387
sudo lsof -nP -i :2387

macOS

sudo lsof -nP -i :2387

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2387 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2387
netstat -ano | findstr :2387

From another machine

nmap -p 2387 -sV <host>
sudo nmap -sU -p 2387 <host>
nc -zv <host> 2387

Block it in the firewall

sudo ufw deny 2387/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2387" -Direction Inbound -LocalPort 2387 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2387 used for?

Port 2387 is assigned by IANA to vsamredirector (VSAM Redirector).

Is port 2387 TCP or UDP?

Port 2387 is registered for TCP and UDP.

Is it safe to open port 2387?

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 2387 is open?

On Linux run "ss -ltnup 'sport = :2387'", on macOS "lsof -nP -i :2387", and on Windows "netstat -ano | findstr :2387" to see the local process. From another machine, "nmap -p 2387 <host>" shows whether it is reachable.

05 Related
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