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// Network services

Port 40853: ORTEC Service Discovery

Port 40853 is assigned by IANA to ortec-disc (ORTEC Service Discovery).

40853

How ortec-disc works

Network services
client:40853ortec-discresponse client:40853ortec-discresponse

The client sends a request to port 40853 and the ortec-disc service answers.

Transport
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
Network services
01 Security

Is port 40853 dangerous?

We have no specific security note for port 40853. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 40853

ServicePortTransportDescriptionReferenceUpdated
ortec-disc 40853 UDP ORTEC Service Discovery - 2010-11-22
-40853-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 40853, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40853'      # process listening on 40853
sudo lsof -nP -i :40853

macOS

sudo lsof -nP -i :40853

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40853 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40853
netstat -ano | findstr :40853

From another machine

nmap -p 40853 -sV <host>
sudo nmap -sU -p 40853 <host>
nc -zv <host> 40853

Block it in the firewall

sudo ufw deny 40853/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40853" -Direction Inbound -LocalPort 40853 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 40853 used for?

Port 40853 is assigned by IANA to ortec-disc (ORTEC Service Discovery).

Is port 40853 TCP or UDP?

Port 40853 is registered for UDP.

Is it safe to open port 40853?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 40853 is open?

On Linux run "ss -ltnup 'sport = :40853'", on macOS "lsof -nP -i :40853", and on Windows "netstat -ano | findstr :40853" to see the local process. From another machine, "nmap -p 40853 <host>" shows whether it is reachable.

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