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// Other services

Port 1953: Rapid Base

Port 1953 is assigned by IANA to rapidbase (Rapid Base).

1953

How rapidbase works

Other services
client:1953rapidbaseresponse client:1953rapidbaseresponse

The client sends a request to port 1953 and the rapidbase 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 1953 dangerous?

We have no specific security note for port 1953. 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 1953

ServicePortTransportDescriptionReferenceUpdated
rapidbase 1953 TCP, UDP Rapid Base - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1953, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1953'      # process listening on 1953
sudo lsof -nP -i :1953

macOS

sudo lsof -nP -i :1953

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1953 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1953
netstat -ano | findstr :1953

From another machine

nmap -p 1953 -sV <host>
sudo nmap -sU -p 1953 <host>
nc -zv <host> 1953

Block it in the firewall

sudo ufw deny 1953/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1953" -Direction Inbound -LocalPort 1953 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1953 used for?

Port 1953 is assigned by IANA to rapidbase (Rapid Base).

Is port 1953 TCP or UDP?

Port 1953 is registered for TCP and UDP.

Is it safe to open port 1953?

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 1953 is open?

On Linux run "ss -ltnup 'sport = :1953'", on macOS "lsof -nP -i :1953", and on Windows "netstat -ano | findstr :1953" to see the local process. From another machine, "nmap -p 1953 <host>" shows whether it is reachable.

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