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// Other services

Port 2027:

Port 2027 is assigned by IANA to shadowserver ().

2027

How shadowserver works

Other services
client:2027shadowserverresponse client:2027shadowserverresponse

The client sends a request to port 2027 and the shadowserver 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 2027 dangerous?

We have no specific security note for port 2027. 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 2027

ServicePortTransportDescriptionReferenceUpdated
shadowserver 2027 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2027, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2027'      # process listening on 2027
sudo lsof -nP -i :2027

macOS

sudo lsof -nP -i :2027

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2027 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2027
netstat -ano | findstr :2027

From another machine

nmap -p 2027 -sV <host>
sudo nmap -sU -p 2027 <host>
nc -zv <host> 2027

Block it in the firewall

sudo ufw deny 2027/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2027" -Direction Inbound -LocalPort 2027 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2027 used for?

Port 2027 is assigned by IANA to shadowserver ().

Is port 2027 TCP or UDP?

Port 2027 is registered for TCP and UDP.

Is it safe to open port 2027?

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 2027 is open?

On Linux run "ss -ltnup 'sport = :2027'", on macOS "lsof -nP -i :2027", and on Windows "netstat -ano | findstr :2027" to see the local process. From another machine, "nmap -p 2027 <host>" shows whether it is reachable.

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