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// Other services

Port 1699: RSVP-ENCAPSULATION-2

Port 1699 is assigned by IANA to rsvp-encap-2 (RSVP-ENCAPSULATION-2).

1699

How rsvp-encap-2 works

Other services
client:1699rsvp-encap-2response client:1699rsvp-encap-2response

The client sends a request to port 1699 and the rsvp-encap-2 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 1699 dangerous?

We have no specific security note for port 1699. 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 1699

ServicePortTransportDescriptionReferenceUpdated
rsvp-encap-2 1699 TCP, UDP RSVP-ENCAPSULATION-2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1699, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1699'      # process listening on 1699
sudo lsof -nP -i :1699

macOS

sudo lsof -nP -i :1699

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1699 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1699
netstat -ano | findstr :1699

From another machine

nmap -p 1699 -sV <host>
sudo nmap -sU -p 1699 <host>
nc -zv <host> 1699

Block it in the firewall

sudo ufw deny 1699/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1699" -Direction Inbound -LocalPort 1699 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1699 used for?

Port 1699 is assigned by IANA to rsvp-encap-2 (RSVP-ENCAPSULATION-2).

Is port 1699 TCP or UDP?

Port 1699 is registered for TCP and UDP.

Is it safe to open port 1699?

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 1699 is open?

On Linux run "ss -ltnup 'sport = :1699'", on macOS "lsof -nP -i :1699", and on Windows "netstat -ano | findstr :1699" to see the local process. From another machine, "nmap -p 1699 <host>" shows whether it is reachable.

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