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// Other services

Port 26257: CockroachDB

Port 26257 is assigned by IANA to cockroach (CockroachDB).

26257

How cockroach works

Other services
client:26257cockroachresponse client:26257cockroachresponse

The client sends a request to port 26257 and the cockroach service answers.

Transport
TCP
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 26257 dangerous?

We have no specific security note for port 26257. 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 26257

ServicePortTransportDescriptionReferenceUpdated
cockroach 26257 TCP CockroachDB - 2015-09-29
-26257-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 26257, and is it reachable?

Linux

sudo ss -ltnup 'sport = :26257'      # process listening on 26257
sudo lsof -nP -i :26257

macOS

sudo lsof -nP -i :26257

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 26257 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 26257
netstat -ano | findstr :26257

From another machine

nmap -p 26257 -sV <host>
nc -zv <host> 26257

Block it in the firewall

sudo ufw deny 26257/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 26257" -Direction Inbound -LocalPort 26257 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 26257 used for?

Port 26257 is assigned by IANA to cockroach (CockroachDB).

Is port 26257 TCP or UDP?

Port 26257 is registered for TCP.

Is it safe to open port 26257?

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 26257 is open?

On Linux run "ss -ltnup 'sport = :26257'", on macOS "lsof -nP -i :26257", and on Windows "netstat -ano | findstr :26257" to see the local process. From another machine, "nmap -p 26257 <host>" shows whether it is reachable.

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