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// Other services

Port 730: IBM NetView DM/6000 send/tcp

Port 730 is assigned by IANA to netviewdm2 (IBM NetView DM/6000 send/tcp).

730

How netviewdm2 works

Other services
client:730netviewdm2response client:730netviewdm2response

The client sends a request to port 730 and the netviewdm2 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 730 dangerous?

We have no specific security note for port 730. 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 730

ServicePortTransportDescriptionReferenceUpdated
netviewdm2 730 TCP, UDP IBM NetView DM/6000 send/tcp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 730, and is it reachable?

Linux

sudo ss -ltnup 'sport = :730'      # process listening on 730
sudo lsof -nP -i :730

macOS

sudo lsof -nP -i :730

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 730 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 730
netstat -ano | findstr :730

From another machine

nmap -p 730 -sV <host>
sudo nmap -sU -p 730 <host>
nc -zv <host> 730

Block it in the firewall

sudo ufw deny 730/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 730" -Direction Inbound -LocalPort 730 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 730 used for?

Port 730 is assigned by IANA to netviewdm2 (IBM NetView DM/6000 send/tcp).

Is port 730 TCP or UDP?

Port 730 is registered for TCP and UDP.

Is it safe to open port 730?

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 730 is open?

On Linux run "ss -ltnup 'sport = :730'", on macOS "lsof -nP -i :730", and on Windows "netstat -ano | findstr :730" to see the local process. From another machine, "nmap -p 730 <host>" shows whether it is reachable.

05 Related
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