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Local dataset, no network
// Other services

Port 729: IBM NetView DM/6000 Server/Client

Port 729 is assigned by IANA to netviewdm1 (IBM NetView DM/6000 Server/Client).

729

How netviewdm1 works

Other services
client:729netviewdm1response client:729netviewdm1response

The client sends a request to port 729 and the netviewdm1 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 729 dangerous?

We have no specific security note for port 729. 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 729

ServicePortTransportDescriptionReferenceUpdated
netviewdm1 729 TCP, UDP IBM NetView DM/6000 Server/Client - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 729, and is it reachable?

Linux

sudo ss -ltnup 'sport = :729'      # process listening on 729
sudo lsof -nP -i :729

macOS

sudo lsof -nP -i :729

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 729 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 729
netstat -ano | findstr :729

From another machine

nmap -p 729 -sV <host>
sudo nmap -sU -p 729 <host>
nc -zv <host> 729

Block it in the firewall

sudo ufw deny 729/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 729" -Direction Inbound -LocalPort 729 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 729 used for?

Port 729 is assigned by IANA to netviewdm1 (IBM NetView DM/6000 Server/Client).

Is port 729 TCP or UDP?

Port 729 is registered for TCP and UDP.

Is it safe to open port 729?

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 729 is open?

On Linux run "ss -ltnup 'sport = :729'", on macOS "lsof -nP -i :729", and on Windows "netstat -ano | findstr :729" to see the local process. From another machine, "nmap -p 729 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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