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Local dataset, no network
// Other services

Port 4988: SMAR Ethernet Port 2

Port 4988 is assigned by IANA to smar-se-port2 (SMAR Ethernet Port 2).

4988

How smar-se-port2 works

Other services
client:4988smar-se-port2response client:4988smar-se-port2response

The client sends a request to port 4988 and the smar-se-port2 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 4988 dangerous?

We have no specific security note for port 4988. 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 4988

ServicePortTransportDescriptionReferenceUpdated
smar-se-port2 4988 TCP, UDP SMAR Ethernet Port 2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4988, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4988'      # process listening on 4988
sudo lsof -nP -i :4988

macOS

sudo lsof -nP -i :4988

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4988 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4988
netstat -ano | findstr :4988

From another machine

nmap -p 4988 -sV <host>
sudo nmap -sU -p 4988 <host>
nc -zv <host> 4988

Block it in the firewall

sudo ufw deny 4988/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4988" -Direction Inbound -LocalPort 4988 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4988 used for?

Port 4988 is assigned by IANA to smar-se-port2 (SMAR Ethernet Port 2).

Is port 4988 TCP or UDP?

Port 4988 is registered for TCP and UDP.

Is it safe to open port 4988?

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 4988 is open?

On Linux run "ss -ltnup 'sport = :4988'", on macOS "lsof -nP -i :4988", and on Windows "netstat -ano | findstr :4988" to see the local process. From another machine, "nmap -p 4988 <host>" shows whether it is reachable.

05 Related
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