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// Other services

Port 3455: RSVP Port

Port 3455 is assigned by IANA to prsvp (RSVP Port).

3455

How prsvp works

Other services
client:3455prsvpresponse client:3455prsvpresponse

The client sends a request to port 3455 and the prsvp 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 3455 dangerous?

We have no specific security note for port 3455. 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 3455

ServicePortTransportDescriptionReferenceUpdated
prsvp 3455 TCP, UDP RSVP Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3455, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3455'      # process listening on 3455
sudo lsof -nP -i :3455

macOS

sudo lsof -nP -i :3455

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3455 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3455
netstat -ano | findstr :3455

From another machine

nmap -p 3455 -sV <host>
sudo nmap -sU -p 3455 <host>
nc -zv <host> 3455

Block it in the firewall

sudo ufw deny 3455/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3455" -Direction Inbound -LocalPort 3455 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3455 used for?

Port 3455 is assigned by IANA to prsvp (RSVP Port).

Is port 3455 TCP or UDP?

Port 3455 is registered for TCP and UDP.

Is it safe to open port 3455?

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 3455 is open?

On Linux run "ss -ltnup 'sport = :3455'", on macOS "lsof -nP -i :3455", and on Windows "netstat -ano | findstr :3455" to see the local process. From another machine, "nmap -p 3455 <host>" shows whether it is reachable.

05 Related
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