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// Other services

Port 23053: Generic Notification Transport Protocol

Port 23053 is assigned by IANA to gntp (Generic Notification Transport Protocol).

23053

How gntp works

Other services
client:23053gntpresponse client:23053gntpresponse

The client sends a request to port 23053 and the gntp 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 23053 dangerous?

We have no specific security note for port 23053. 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 23053

ServicePortTransportDescriptionReferenceUpdated
gntp 23053 TCP Generic Notification Transport Protocol - 2012-02-07
-23053-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 23053, and is it reachable?

Linux

sudo ss -ltnup 'sport = :23053'      # process listening on 23053
sudo lsof -nP -i :23053

macOS

sudo lsof -nP -i :23053

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 23053 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 23053
netstat -ano | findstr :23053

From another machine

nmap -p 23053 -sV <host>
nc -zv <host> 23053

Block it in the firewall

sudo ufw deny 23053/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 23053" -Direction Inbound -LocalPort 23053 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 23053 used for?

Port 23053 is assigned by IANA to gntp (Generic Notification Transport Protocol).

Is port 23053 TCP or UDP?

Port 23053 is registered for TCP.

Is it safe to open port 23053?

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 23053 is open?

On Linux run "ss -ltnup 'sport = :23053'", on macOS "lsof -nP -i :23053", and on Windows "netstat -ano | findstr :23053" to see the local process. From another machine, "nmap -p 23053 <host>" shows whether it is reachable.

05 Related
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