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// Other services

Port 4420: NVM Express over Fabrics storage access

Port 4420 is assigned by IANA to nvme (NVM Express over Fabrics storage access).

4420

How nvme works

Other services
client:4420nvmeresponse client:4420nvmeresponse

The client sends a request to port 4420 and the nvme 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 4420 dangerous?

We have no specific security note for port 4420. 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 4420

ServicePortTransportDescriptionReferenceUpdated
nvme 4420 TCP, UDP NVM Express over Fabrics storage access - 2018-03-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 4420, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4420'      # process listening on 4420
sudo lsof -nP -i :4420

macOS

sudo lsof -nP -i :4420

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4420 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4420
netstat -ano | findstr :4420

From another machine

nmap -p 4420 -sV <host>
sudo nmap -sU -p 4420 <host>
nc -zv <host> 4420

Block it in the firewall

sudo ufw deny 4420/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4420" -Direction Inbound -LocalPort 4420 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4420 used for?

Port 4420 is assigned by IANA to nvme (NVM Express over Fabrics storage access).

Is port 4420 TCP or UDP?

Port 4420 is registered for TCP and UDP.

Is it safe to open port 4420?

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 4420 is open?

On Linux run "ss -ltnup 'sport = :4420'", on macOS "lsof -nP -i :4420", and on Windows "netstat -ano | findstr :4420" to see the local process. From another machine, "nmap -p 4420 <host>" shows whether it is reachable.

05 Related
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