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// Other services

Port 1622: ontime

Port 1622 is assigned by IANA to ontime (ontime).

1622

How ontime works

Other services
client:1622ontimeresponse client:1622ontimeresponse

The client sends a request to port 1622 and the ontime 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 1622 dangerous?

We have no specific security note for port 1622. 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 1622

ServicePortTransportDescriptionReferenceUpdated
ontime 1622 TCP, UDP ontime - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1622, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1622'      # process listening on 1622
sudo lsof -nP -i :1622

macOS

sudo lsof -nP -i :1622

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1622 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1622
netstat -ano | findstr :1622

From another machine

nmap -p 1622 -sV <host>
sudo nmap -sU -p 1622 <host>
nc -zv <host> 1622

Block it in the firewall

sudo ufw deny 1622/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1622" -Direction Inbound -LocalPort 1622 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1622 used for?

Port 1622 is assigned by IANA to ontime (ontime).

Is port 1622 TCP or UDP?

Port 1622 is registered for TCP and UDP.

Is it safe to open port 1622?

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 1622 is open?

On Linux run "ss -ltnup 'sport = :1622'", on macOS "lsof -nP -i :1622", and on Windows "netstat -ano | findstr :1622" to see the local process. From another machine, "nmap -p 1622 <host>" shows whether it is reachable.

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