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// Other services

Port 3968: iAnywhere DBNS

Port 3968 is assigned by IANA to ianywhere-dbns (iAnywhere DBNS).

3968

How ianywhere-dbns works

Other services
client:3968ianywhere-dbnsresponse client:3968ianywhere-dbnsresponse

The client sends a request to port 3968 and the ianywhere-dbns 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 3968 dangerous?

We have no specific security note for port 3968. 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 3968

ServicePortTransportDescriptionReferenceUpdated
ianywhere-dbns 3968 TCP, UDP iAnywhere DBNS - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3968, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3968'      # process listening on 3968
sudo lsof -nP -i :3968

macOS

sudo lsof -nP -i :3968

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3968 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3968
netstat -ano | findstr :3968

From another machine

nmap -p 3968 -sV <host>
sudo nmap -sU -p 3968 <host>
nc -zv <host> 3968

Block it in the firewall

sudo ufw deny 3968/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3968" -Direction Inbound -LocalPort 3968 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3968 used for?

Port 3968 is assigned by IANA to ianywhere-dbns (iAnywhere DBNS).

Is port 3968 TCP or UDP?

Port 3968 is registered for TCP and UDP.

Is it safe to open port 3968?

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 3968 is open?

On Linux run "ss -ltnup 'sport = :3968'", on macOS "lsof -nP -i :3968", and on Windows "netstat -ano | findstr :3968" to see the local process. From another machine, "nmap -p 3968 <host>" shows whether it is reachable.

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