CyberHunter
Local dataset, no network
// Other services

Port 151: HEMS

Port 151 is assigned by IANA to hems (HEMS).

151

How hems works

Other services
client:151hemsresponse client:151hemsresponse

The client sends a request to port 151 and the hems 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 151 dangerous?

We have no specific security note for port 151. 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 151

ServicePortTransportDescriptionReferenceUpdated
hems 151 TCP, UDP HEMS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 151, and is it reachable?

Linux

sudo ss -ltnup 'sport = :151'      # process listening on 151
sudo lsof -nP -i :151

macOS

sudo lsof -nP -i :151

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 151 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 151
netstat -ano | findstr :151

From another machine

nmap -p 151 -sV <host>
sudo nmap -sU -p 151 <host>
nc -zv <host> 151

Block it in the firewall

sudo ufw deny 151/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 151" -Direction Inbound -LocalPort 151 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 151 used for?

Port 151 is assigned by IANA to hems (HEMS).

Is port 151 TCP or UDP?

Port 151 is registered for TCP and UDP.

Is it safe to open port 151?

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 151 is open?

On Linux run "ss -ltnup 'sport = :151'", on macOS "lsof -nP -i :151", and on Windows "netstat -ano | findstr :151" to see the local process. From another machine, "nmap -p 151 <host>" shows whether it is reachable.

05 Related
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