CyberHunter
Local dataset, no network
// Other services

Port 1343: re101

Port 1343 is assigned by IANA to re101 (re101).

1343

How re101 works

Other services
client:1343re101response client:1343re101response

The client sends a request to port 1343 and the re101 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 1343 dangerous?

We have no specific security note for port 1343. 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 1343

ServicePortTransportDescriptionReferenceUpdated
re101 1343 TCP, UDP re101 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1343, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1343'      # process listening on 1343
sudo lsof -nP -i :1343

macOS

sudo lsof -nP -i :1343

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1343 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1343
netstat -ano | findstr :1343

From another machine

nmap -p 1343 -sV <host>
sudo nmap -sU -p 1343 <host>
nc -zv <host> 1343

Block it in the firewall

sudo ufw deny 1343/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1343" -Direction Inbound -LocalPort 1343 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1343 used for?

Port 1343 is assigned by IANA to re101 (re101).

Is port 1343 TCP or UDP?

Port 1343 is registered for TCP and UDP.

Is it safe to open port 1343?

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 1343 is open?

On Linux run "ss -ltnup 'sport = :1343'", on macOS "lsof -nP -i :1343", and on Windows "netstat -ano | findstr :1343" to see the local process. From another machine, "nmap -p 1343 <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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