Port 1171AT+C FmiApplicationServer

AT+C FmiApplicationServer service assigned to TCP and UDP port 1171.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as atc-appserver

Technical Details

what runs on :1171

AT+C FmiApplicationServer is registered on port :1171 over tcp and udp to Peter Schafer, assigned February 2004. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :1171

this machine

# linux
sudo ss -tulpn 'sport = :1171'

# macos / bsd
sudo lsof -nP -i :1171

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1171

another host

nmap -sV -p T:1171 <host>
sudo nmap -sU -sV -p U:1171 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :1171

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :1171 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :1171
service: AT+C FmiApplicationServer
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: Port 1171 is assigned to the AT+C FmiApplicationServer service. The assignment was registered to Peter Schafer in 2004; no public deployment details are provided.
lookups: 0rank 993
added: 2026-09-16
updated: 2026-09-16
references: IANA service name registry — port 1171

Something wrong?

This record is maintained by the engineers who use port 1171. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-16.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :1171, by lookups.

port	service	proto	category	risk	views
:1220	QTSS Admin	TCP	Streaming	safe	20.6k
:1200	SCOL Name Service	TCP	Network Services	caution	15.5k
:1200	Steam Friends Applet	UDP	Gaming	caution	13.0k
:1182	AcceleNet ITP	TCPUDP	Network Services	caution	12.4k
:1234	VLC RTP Streaming	UDP	Streaming	safe	11.7k
:1194	OpenVPN	TCPUDP	Security	caution	11.2k
:1110	EasyBits School Discovery	UDP	Network Services	caution	11.1k
:1169	Tripwire	TCPUDP	Security	caution	9.4k

risk mix of the 8 listed

safe25%
caution75%

0 of 8 encrypted

Port :1171AT+C FmiApplicationServer

Technical Details

Security Information

Related Ports

Port 1171AT+C FmiApplicationServer