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// Other services

Port 5813: ICMPD

Port 5813 is assigned by IANA to icmpd (ICMPD).

5813

How icmpd works

Other services
client:5813icmpdresponse client:5813icmpdresponse

The client sends a request to port 5813 and the icmpd 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 5813 dangerous?

We have no specific security note for port 5813. 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 5813

ServicePortTransportDescriptionReferenceUpdated
icmpd 5813 TCP, UDP ICMPD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5813, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5813'      # process listening on 5813
sudo lsof -nP -i :5813

macOS

sudo lsof -nP -i :5813

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5813 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5813
netstat -ano | findstr :5813

From another machine

nmap -p 5813 -sV <host>
sudo nmap -sU -p 5813 <host>
nc -zv <host> 5813

Block it in the firewall

sudo ufw deny 5813/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5813" -Direction Inbound -LocalPort 5813 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5813 used for?

Port 5813 is assigned by IANA to icmpd (ICMPD).

Is port 5813 TCP or UDP?

Port 5813 is registered for TCP and UDP.

Is it safe to open port 5813?

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 5813 is open?

On Linux run "ss -ltnup 'sport = :5813'", on macOS "lsof -nP -i :5813", and on Windows "netstat -ano | findstr :5813" to see the local process. From another machine, "nmap -p 5813 <host>" shows whether it is reachable.

05 Related
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