CyberHunter
Local dataset, no network
// Other services

Port 1171: AT+C FmiApplicationServer

Port 1171 is assigned by IANA to atc-appserver (AT+C FmiApplicationServer).

1171

How atc-appserver works

Other services
client:1171atc-appserverresponse client:1171atc-appserverresponse

The client sends a request to port 1171 and the atc-appserver 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 1171 dangerous?

We have no specific security note for port 1171. 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 1171

ServicePortTransportDescriptionReferenceUpdated
atc-appserver 1171 TCP, UDP AT+C FmiApplicationServer - 2004-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 1171, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1171'      # process listening on 1171
sudo lsof -nP -i :1171

macOS

sudo lsof -nP -i :1171

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1171 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1171
netstat -ano | findstr :1171

From another machine

nmap -p 1171 -sV <host>
sudo nmap -sU -p 1171 <host>
nc -zv <host> 1171

Block it in the firewall

sudo ufw deny 1171/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1171" -Direction Inbound -LocalPort 1171 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1171 used for?

Port 1171 is assigned by IANA to atc-appserver (AT+C FmiApplicationServer).

Is port 1171 TCP or UDP?

Port 1171 is registered for TCP and UDP.

Is it safe to open port 1171?

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 1171 is open?

On Linux run "ss -ltnup 'sport = :1171'", on macOS "lsof -nP -i :1171", and on Windows "netstat -ano | findstr :1171" to see the local process. From another machine, "nmap -p 1171 <host>" shows whether it is reachable.

05 Related
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