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// Other services

Port 210: ANSI Z39.50 IANA assigned this well-formed service name as a replacement for "z39.50".

Port 210 is assigned by IANA to z39-50 (ANSI Z39.50 IANA assigned this well-formed service name as a replacement for "z39.50".), z39.50 (ANSI Z39.50).

210

How z39-50 works

Other services
client:210z39-50response client:210z39-50response

The client sends a request to port 210 and the z39-50 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 210 dangerous?

We have no specific security note for port 210. 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 210

ServicePortTransportDescriptionReferenceUpdated
z39-50 210 TCP, UDP ANSI Z39.50 IANA assigned this well-formed service name as a replacement for "z39.50". - -
z39.50 210 TCP, UDP ANSI Z39.50 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 210, and is it reachable?

Linux

sudo ss -ltnup 'sport = :210'      # process listening on 210
sudo lsof -nP -i :210

macOS

sudo lsof -nP -i :210

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 210 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 210
netstat -ano | findstr :210

From another machine

nmap -p 210 -sV <host>
sudo nmap -sU -p 210 <host>
nc -zv <host> 210

Block it in the firewall

sudo ufw deny 210/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 210" -Direction Inbound -LocalPort 210 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 210 used for?

Port 210 is assigned by IANA to z39-50 (ANSI Z39.50 IANA assigned this well-formed service name as a replacement for "z39.50".), z39.50 (ANSI Z39.50).

Is port 210 TCP or UDP?

Port 210 is registered for TCP and UDP.

Is it safe to open port 210?

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 210 is open?

On Linux run "ss -ltnup 'sport = :210'", on macOS "lsof -nP -i :210", and on Windows "netstat -ano | findstr :210" to see the local process. From another machine, "nmap -p 210 <host>" shows whether it is reachable.

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