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// Other services

Port 16900: Newbay Mobile Client Update Service

Port 16900 is assigned by IANA to newbay-snc-mc (Newbay Mobile Client Update Service).

16900

How newbay-snc-mc works

Other services
client:16900newbay-snc-mcresponse client:16900newbay-snc-mcresponse

The client sends a request to port 16900 and the newbay-snc-mc 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 16900 dangerous?

We have no specific security note for port 16900. 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 16900

ServicePortTransportDescriptionReferenceUpdated
newbay-snc-mc 16900 TCP, UDP Newbay Mobile Client Update Service - 2009-07-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 16900, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16900'      # process listening on 16900
sudo lsof -nP -i :16900

macOS

sudo lsof -nP -i :16900

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16900 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16900
netstat -ano | findstr :16900

From another machine

nmap -p 16900 -sV <host>
sudo nmap -sU -p 16900 <host>
nc -zv <host> 16900

Block it in the firewall

sudo ufw deny 16900/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16900" -Direction Inbound -LocalPort 16900 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16900 used for?

Port 16900 is assigned by IANA to newbay-snc-mc (Newbay Mobile Client Update Service).

Is port 16900 TCP or UDP?

Port 16900 is registered for TCP and UDP.

Is it safe to open port 16900?

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 16900 is open?

On Linux run "ss -ltnup 'sport = :16900'", on macOS "lsof -nP -i :16900", and on Windows "netstat -ano | findstr :16900" to see the local process. From another machine, "nmap -p 16900 <host>" shows whether it is reachable.

05 Related
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