Port 4687
nst · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | nst |
| Registered | 2005-08 |
Frequently asked questions
What is port 4687 used for?
Port 4687 is registered with the IANA for nst (TCP/UDP). Description: Network Scanner Tool FTP.
Is port 4687 a well-known port?
No. Port 4687 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 4687 is open?
Locally on Linux with ss -tulpn | grep ':4687\b', on Windows with netstat -ano | findstr :4687. To test a remote host use Test-NetConnection <host> -Port 4687 in PowerShell or nc -zv <host> 4687 on Linux/macOS.
How do I open port 4687 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 4687/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4687/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4687" -Direction Inbound -Protocol TCP -LocalPort 4687 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | nst | Network Scanner Tool FTP |
| UDP | nst | Network Scanner Tool FTP |