CyberHunter
Local dataset, no network
// Other services

Port 1321: PIP

Port 1321 is assigned by IANA to pip (PIP).

1321

How pip works

Other services
client:1321pipresponse client:1321pipresponse

The client sends a request to port 1321 and the pip 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 1321 dangerous?

We have no specific security note for port 1321. 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 1321

ServicePortTransportDescriptionReferenceUpdated
pip 1321 TCP, UDP PIP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1321, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1321'      # process listening on 1321
sudo lsof -nP -i :1321

macOS

sudo lsof -nP -i :1321

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1321 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1321
netstat -ano | findstr :1321

From another machine

nmap -p 1321 -sV <host>
sudo nmap -sU -p 1321 <host>
nc -zv <host> 1321

Block it in the firewall

sudo ufw deny 1321/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1321" -Direction Inbound -LocalPort 1321 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1321 used for?

Port 1321 is assigned by IANA to pip (PIP).

Is port 1321 TCP or UDP?

Port 1321 is registered for TCP and UDP.

Is it safe to open port 1321?

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 1321 is open?

On Linux run "ss -ltnup 'sport = :1321'", on macOS "lsof -nP -i :1321", and on Windows "netstat -ano | findstr :1321" to see the local process. From another machine, "nmap -p 1321 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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