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// Other services

Port 1222: SNI R&D network

Port 1222 is assigned by IANA to nerv (SNI R&D network).

1222

How nerv works

Other services
client:1222nervresponse client:1222nervresponse

The client sends a request to port 1222 and the nerv 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 1222 dangerous?

We have no specific security note for port 1222. 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 1222

ServicePortTransportDescriptionReferenceUpdated
nerv 1222 TCP, UDP SNI R&D network - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1222, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1222'      # process listening on 1222
sudo lsof -nP -i :1222

macOS

sudo lsof -nP -i :1222

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1222 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1222
netstat -ano | findstr :1222

From another machine

nmap -p 1222 -sV <host>
sudo nmap -sU -p 1222 <host>
nc -zv <host> 1222

Block it in the firewall

sudo ufw deny 1222/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1222" -Direction Inbound -LocalPort 1222 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1222 used for?

Port 1222 is assigned by IANA to nerv (SNI R&D network).

Is port 1222 TCP or UDP?

Port 1222 is registered for TCP and UDP.

Is it safe to open port 1222?

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 1222 is open?

On Linux run "ss -ltnup 'sport = :1222'", on macOS "lsof -nP -i :1222", and on Windows "netstat -ano | findstr :1222" to see the local process. From another machine, "nmap -p 1222 <host>" shows whether it is reachable.

05 Related
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