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// Other services

Port 1022: RFC3692-style Experiment 2

Port 1022 is assigned by IANA to exp2 (RFC3692-style Experiment 2).

1022

How exp2 works

Other services
client:1022exp2response client:1022exp2response

The client sends a request to port 1022 and the exp2 service answers.

Transport
TCP · UDP · SCTP · DCCP
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 1022 dangerous?

We have no specific security note for port 1022. 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 1022

ServicePortTransportDescriptionReferenceUpdated
exp2 1022 TCP, UDP, SCTP, DCCP RFC3692-style Experiment 2 1, RFC 4727, RFC 6335 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1022, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1022'      # process listening on 1022
sudo lsof -nP -i :1022

macOS

sudo lsof -nP -i :1022

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1022 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1022
netstat -ano | findstr :1022

From another machine

nmap -p 1022 -sV <host>
sudo nmap -sU -p 1022 <host>
nc -zv <host> 1022

Block it in the firewall

sudo ufw deny 1022/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1022" -Direction Inbound -LocalPort 1022 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1022 used for?

Port 1022 is assigned by IANA to exp2 (RFC3692-style Experiment 2).

Is port 1022 TCP or UDP?

Port 1022 is registered for TCP and UDP and SCTP and DCCP.

Is it safe to open port 1022?

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 1022 is open?

On Linux run "ss -ltnup 'sport = :1022'", on macOS "lsof -nP -i :1022", and on Windows "netstat -ano | findstr :1022" to see the local process. From another machine, "nmap -p 1022 <host>" shows whether it is reachable.

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