- 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 3939: Anti-virus Application Management Port
Port 3939 is assigned by IANA to aamp (Anti-virus Application Management Port).
3939
How aamp works
Other servicesThe client sends a request to port 3939 and the aamp 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 3939 dangerous?
We have no specific security note for port 3939. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 3939
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| aamp | 3939 | TCP, UDP | Anti-virus Application Management Port | - | 2002-02 |
// source: IANA service name and port number registry
Which program uses port 3939, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3939' # process listening on 3939
sudo lsof -nP -i :3939macOS
sudo lsof -nP -i :3939
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3939 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3939 netstat -ano | findstr :3939
From another machine
nmap -p 3939 -sV <host> sudo nmap -sU -p 3939 <host> nc -zv <host> 3939
Block it in the firewall
sudo ufw deny 3939/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3939" -Direction Inbound -LocalPort 3939 -Protocol TCP -Action Block # Windows
What is port 3939 used for?
Port 3939 is assigned by IANA to aamp (Anti-virus Application Management Port).
Is port 3939 TCP or UDP?
Port 3939 is registered for TCP and UDP.
Is it safe to open port 3939?
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 3939 is open?
On Linux run "ss -ltnup 'sport = :3939'", on macOS "lsof -nP -i :3939", and on Windows "netstat -ano | findstr :3939" to see the local process. From another machine, "nmap -p 3939 <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