CyberHunter
Local dataset, no network
// Other services

Port 153: SGMP

Port 153 is assigned by IANA to sgmp (SGMP).

153

How sgmp works

Other services
client:153sgmpresponse client:153sgmpresponse

The client sends a request to port 153 and the sgmp 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 153 dangerous?

We have no specific security note for port 153. 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 153

ServicePortTransportDescriptionReferenceUpdated
sgmp 153 TCP, UDP SGMP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 153, and is it reachable?

Linux

sudo ss -ltnup 'sport = :153'      # process listening on 153
sudo lsof -nP -i :153

macOS

sudo lsof -nP -i :153

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 153 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 153
netstat -ano | findstr :153

From another machine

nmap -p 153 -sV <host>
sudo nmap -sU -p 153 <host>
nc -zv <host> 153

Block it in the firewall

sudo ufw deny 153/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 153" -Direction Inbound -LocalPort 153 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 153 used for?

Port 153 is assigned by IANA to sgmp (SGMP).

Is port 153 TCP or UDP?

Port 153 is registered for TCP and UDP.

Is it safe to open port 153?

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 153 is open?

On Linux run "ss -ltnup 'sport = :153'", on macOS "lsof -nP -i :153", and on Windows "netstat -ano | findstr :153" to see the local process. From another machine, "nmap -p 153 <host>" shows whether it is reachable.

05 Related
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