CyberHunter
Local dataset, no network
// Other services

Port 1739: webaccess

Port 1739 is assigned by IANA to webaccess (webaccess).

1739

How webaccess works

Other services
client:1739webaccessresponse client:1739webaccessresponse

The client sends a request to port 1739 and the webaccess 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 1739 dangerous?

We have no specific security note for port 1739. 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 1739

ServicePortTransportDescriptionReferenceUpdated
webaccess 1739 TCP, UDP webaccess - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1739, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1739'      # process listening on 1739
sudo lsof -nP -i :1739

macOS

sudo lsof -nP -i :1739

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1739 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1739
netstat -ano | findstr :1739

From another machine

nmap -p 1739 -sV <host>
sudo nmap -sU -p 1739 <host>
nc -zv <host> 1739

Block it in the firewall

sudo ufw deny 1739/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1739" -Direction Inbound -LocalPort 1739 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1739 used for?

Port 1739 is assigned by IANA to webaccess (webaccess).

Is port 1739 TCP or UDP?

Port 1739 is registered for TCP and UDP.

Is it safe to open port 1739?

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 1739 is open?

On Linux run "ss -ltnup 'sport = :1739'", on macOS "lsof -nP -i :1739", and on Windows "netstat -ano | findstr :1739" to see the local process. From another machine, "nmap -p 1739 <host>" shows whether it is reachable.

05 Related
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