- 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.
Port 3811: AMP
Port 3811 is assigned by IANA to amp (AMP).
3811
How amp works
Other servicesThe client sends a request to port 3811 and the amp 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
Is port 3811 dangerous?
We have no specific security note for port 3811. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 3811
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| amp | 3811 | TCP, UDP | AMP | - | 2004-02 |
// source: IANA service name and port number registry
Which program uses port 3811, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3811' # process listening on 3811
sudo lsof -nP -i :3811macOS
sudo lsof -nP -i :3811
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3811 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3811 netstat -ano | findstr :3811
From another machine
nmap -p 3811 -sV <host> sudo nmap -sU -p 3811 <host> nc -zv <host> 3811
Block it in the firewall
sudo ufw deny 3811/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3811" -Direction Inbound -LocalPort 3811 -Protocol TCP -Action Block # Windows
What is port 3811 used for?
Port 3811 is assigned by IANA to amp (AMP).
Is port 3811 TCP or UDP?
Port 3811 is registered for TCP and UDP.
Is it safe to open port 3811?
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 3811 is open?
On Linux run "ss -ltnup 'sport = :3811'", on macOS "lsof -nP -i :3811", and on Windows "netstat -ano | findstr :3811" to see the local process. From another machine, "nmap -p 3811 <host>" shows whether it is reachable.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp