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// Other services

Port 1101: PT2-DISCOVER

Port 1101 is assigned by IANA to pt2-discover (PT2-DISCOVER).

1101

How pt2-discover works

Other services
client:1101pt2-discoverresponse client:1101pt2-discoverresponse

The client sends a request to port 1101 and the pt2-discover 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 1101 dangerous?

We have no specific security note for port 1101. 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 1101

ServicePortTransportDescriptionReferenceUpdated
pt2-discover 1101 TCP, UDP PT2-DISCOVER - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1101, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1101'      # process listening on 1101
sudo lsof -nP -i :1101

macOS

sudo lsof -nP -i :1101

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1101 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1101
netstat -ano | findstr :1101

From another machine

nmap -p 1101 -sV <host>
sudo nmap -sU -p 1101 <host>
nc -zv <host> 1101

Block it in the firewall

sudo ufw deny 1101/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1101" -Direction Inbound -LocalPort 1101 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1101 used for?

Port 1101 is assigned by IANA to pt2-discover (PT2-DISCOVER).

Is port 1101 TCP or UDP?

Port 1101 is registered for TCP and UDP.

Is it safe to open port 1101?

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 1101 is open?

On Linux run "ss -ltnup 'sport = :1101'", on macOS "lsof -nP -i :1101", and on Windows "netstat -ano | findstr :1101" to see the local process. From another machine, "nmap -p 1101 <host>" shows whether it is reachable.

05 Related
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