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// Other services

Port 1645: SightLine

Port 1645 is assigned by IANA to sightline (SightLine).

1645

How sightline works

Other services
client:1645sightlineresponse client:1645sightlineresponse

The client sends a request to port 1645 and the sightline 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 1645 dangerous?

We have no specific security note for port 1645. 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 1645

ServicePortTransportDescriptionReferenceUpdated
sightline 1645 TCP, UDP SightLine - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1645, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1645'      # process listening on 1645
sudo lsof -nP -i :1645

macOS

sudo lsof -nP -i :1645

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1645 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1645
netstat -ano | findstr :1645

From another machine

nmap -p 1645 -sV <host>
sudo nmap -sU -p 1645 <host>
nc -zv <host> 1645

Block it in the firewall

sudo ufw deny 1645/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1645" -Direction Inbound -LocalPort 1645 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1645 used for?

Port 1645 is assigned by IANA to sightline (SightLine).

Is port 1645 TCP or UDP?

Port 1645 is registered for TCP and UDP.

Is it safe to open port 1645?

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 1645 is open?

On Linux run "ss -ltnup 'sport = :1645'", on macOS "lsof -nP -i :1645", and on Windows "netstat -ano | findstr :1645" to see the local process. From another machine, "nmap -p 1645 <host>" shows whether it is reachable.

05 Related
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