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// Other services

Port 18516: HeyThings Device communicate service

Port 18516 is assigned by IANA to heythings (HeyThings Device communicate service).

18516

How heythings works

Other services
client:18516heythingsresponse client:18516heythingsresponse

The client sends a request to port 18516 and the heythings service answers.

Transport
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 18516 dangerous?

We have no specific security note for port 18516. 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 18516

ServicePortTransportDescriptionReferenceUpdated
heythings 18516 UDP HeyThings Device communicate service - 2020-05-13
-18516-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 18516, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18516'      # process listening on 18516
sudo lsof -nP -i :18516

macOS

sudo lsof -nP -i :18516

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18516 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18516
netstat -ano | findstr :18516

From another machine

nmap -p 18516 -sV <host>
sudo nmap -sU -p 18516 <host>
nc -zv <host> 18516

Block it in the firewall

sudo ufw deny 18516/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18516" -Direction Inbound -LocalPort 18516 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 18516 used for?

Port 18516 is assigned by IANA to heythings (HeyThings Device communicate service).

Is port 18516 TCP or UDP?

Port 18516 is registered for UDP.

Is it safe to open port 18516?

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 18516 is open?

On Linux run "ss -ltnup 'sport = :18516'", on macOS "lsof -nP -i :18516", and on Windows "netstat -ano | findstr :18516" to see the local process. From another machine, "nmap -p 18516 <host>" shows whether it is reachable.

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