Port 3947Connect and Control Protocol (CCP)

Protocol for connecting and controlling consumer, commercial, and industrial electronic devices.

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

also known as ccp

Technical Details

what runs on :3947

Connect and Control Protocol (CCP) is registered on port :3947 over tcp and udp to Aaron Myer, assigned June 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 found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :3947

this machine

# linux
sudo ss -tulpn 'sport = :3947'

# macos / bsd
sudo lsof -nP -i :3947

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3947

another host

nmap -sV -p T:3947 <host>
sudo nmap -sU -sV -p U:3947 <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 :3947

risk score

1/ 10safe

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

iot averages 3.5 across 159 ports — this one sits 2.5 below.

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 :3947 yet

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

Record

iana registry entry

port: :3947
service: Connect and Control Protocol (CCP)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: IoT
usage: IANA assigns TCP and UDP port 3947 to the Connect and Control Protocol for consumer, commercial, and industrial electronic devices. The assignment is registered to Aaron Myer; publicly documented implementations and deployment patterns are not established here.
lookups: 0rank 993
added: 2026-08-25
updated: 2026-08-25
references: IANA service name registry — port 3947

Something wrong?

This record is maintained by the engineers who use port 3947. 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 2026-08-25.

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

all 159 in iot →

the 8 most looked-up other ports in iot — 159 ports carry that label.

port	service	proto	category	risk	views
:6543	Jetnet	UDP	Network Services	caution	65.3k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:9600	Omron FINS Communication	UDP	Network Services	caution	33.2k
:4840	OPC UA TCP	TCPUDP	Network Services	caution	26.6k
:5678	Mikrotik MNDP	UDP	Network Services	caution	24.7k
:4843	OPC UA over TLS/SSL	TCPUDPtls	Security	caution	24.6k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:15000	Hypack Data Acquisition	TCP	Network Services	caution	21.4k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :3947Connect and Control Protocol (CCP)

Technical Details

Security Information

Related Ports

Port 3947Connect and Control Protocol (CCP)