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// Other services

Port 7700: EM7 Secure Communications

Port 7700 is assigned by IANA to em7-secom (EM7 Secure Communications).

7700

How em7-secom works

Other services
client:7700em7-secomresponse client:7700em7-secomresponse

The client sends a request to port 7700 and the em7-secom service answers.

Transport
TCP
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 7700 dangerous?

We have no specific security note for port 7700. 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 7700

ServicePortTransportDescriptionReferenceUpdated
em7-secom 7700 TCP EM7 Secure Communications - 2008-06-05
-7700-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 7700, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7700'      # process listening on 7700
sudo lsof -nP -i :7700

macOS

sudo lsof -nP -i :7700

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7700 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7700
netstat -ano | findstr :7700

From another machine

nmap -p 7700 -sV <host>
nc -zv <host> 7700

Block it in the firewall

sudo ufw deny 7700/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7700" -Direction Inbound -LocalPort 7700 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7700 used for?

Port 7700 is assigned by IANA to em7-secom (EM7 Secure Communications).

Is port 7700 TCP or UDP?

Port 7700 is registered for TCP.

Is it safe to open port 7700?

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 7700 is open?

On Linux run "ss -ltnup 'sport = :7700'", on macOS "lsof -nP -i :7700", and on Windows "netstat -ano | findstr :7700" to see the local process. From another machine, "nmap -p 7700 <host>" shows whether it is reachable.

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