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// Other services

Port 1698: RSVP-ENCAPSULATION-1

Port 1698 is assigned by IANA to rsvp-encap-1 (RSVP-ENCAPSULATION-1).

1698

How rsvp-encap-1 works

Other services
client:1698rsvp-encap-1response client:1698rsvp-encap-1response

The client sends a request to port 1698 and the rsvp-encap-1 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 1698 dangerous?

We have no specific security note for port 1698. 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 1698

ServicePortTransportDescriptionReferenceUpdated
rsvp-encap-1 1698 TCP, UDP RSVP-ENCAPSULATION-1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1698, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1698'      # process listening on 1698
sudo lsof -nP -i :1698

macOS

sudo lsof -nP -i :1698

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1698 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1698
netstat -ano | findstr :1698

From another machine

nmap -p 1698 -sV <host>
sudo nmap -sU -p 1698 <host>
nc -zv <host> 1698

Block it in the firewall

sudo ufw deny 1698/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1698" -Direction Inbound -LocalPort 1698 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1698 used for?

Port 1698 is assigned by IANA to rsvp-encap-1 (RSVP-ENCAPSULATION-1).

Is port 1698 TCP or UDP?

Port 1698 is registered for TCP and UDP.

Is it safe to open port 1698?

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 1698 is open?

On Linux run "ss -ltnup 'sport = :1698'", on macOS "lsof -nP -i :1698", and on Windows "netstat -ano | findstr :1698" to see the local process. From another machine, "nmap -p 1698 <host>" shows whether it is reachable.

05 Related
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