CyberHunter
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// Other services

Port 2704: SMS REMCTRL

Port 2704 is assigned by IANA to sms-remctrl (SMS REMCTRL).

2704

How sms-remctrl works

Other services
client:2704sms-remctrlresponse client:2704sms-remctrlresponse

The client sends a request to port 2704 and the sms-remctrl 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 2704 dangerous?

We have no specific security note for port 2704. 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 2704

ServicePortTransportDescriptionReferenceUpdated
sms-remctrl 2704 TCP, UDP SMS REMCTRL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2704, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2704'      # process listening on 2704
sudo lsof -nP -i :2704

macOS

sudo lsof -nP -i :2704

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2704 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2704
netstat -ano | findstr :2704

From another machine

nmap -p 2704 -sV <host>
sudo nmap -sU -p 2704 <host>
nc -zv <host> 2704

Block it in the firewall

sudo ufw deny 2704/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2704" -Direction Inbound -LocalPort 2704 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2704 used for?

Port 2704 is assigned by IANA to sms-remctrl (SMS REMCTRL).

Is port 2704 TCP or UDP?

Port 2704 is registered for TCP and UDP.

Is it safe to open port 2704?

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 2704 is open?

On Linux run "ss -ltnup 'sport = :2704'", on macOS "lsof -nP -i :2704", and on Windows "netstat -ano | findstr :2704" to see the local process. From another machine, "nmap -p 2704 <host>" shows whether it is reachable.

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