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// Other services

Port 2016:

Port 2016 is assigned by IANA to bootserver ().

2016

How bootserver works

Other services
client:2016bootserverresponse client:2016bootserverresponse

The client sends a request to port 2016 and the bootserver 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 2016 dangerous?

We have no specific security note for port 2016. 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 2016

ServicePortTransportDescriptionReferenceUpdated
bootserver 2016 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2016, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2016'      # process listening on 2016
sudo lsof -nP -i :2016

macOS

sudo lsof -nP -i :2016

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2016 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2016
netstat -ano | findstr :2016

From another machine

nmap -p 2016 -sV <host>
sudo nmap -sU -p 2016 <host>
nc -zv <host> 2016

Block it in the firewall

sudo ufw deny 2016/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2016" -Direction Inbound -LocalPort 2016 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2016 used for?

Port 2016 is assigned by IANA to bootserver ().

Is port 2016 TCP or UDP?

Port 2016 is registered for TCP and UDP.

Is it safe to open port 2016?

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 2016 is open?

On Linux run "ss -ltnup 'sport = :2016'", on macOS "lsof -nP -i :2016", and on Windows "netstat -ano | findstr :2016" to see the local process. From another machine, "nmap -p 2016 <host>" shows whether it is reachable.

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