- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 1397: Audio Active Mail
Port 1397 is assigned by IANA to audio-activmail (Audio Active Mail).
1397
How audio-activmail works
EmailMail servers hand messages to each other over port 1397, one hop at a time, until the recipient's server.
- 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
Is port 1397 dangerous?
We have no specific security note for port 1397. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 1397
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| audio-activmail | 1397 | TCP, UDP | Audio Active Mail | - | - |
// source: IANA service name and port number registry
Which program uses port 1397, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1397' # process listening on 1397
sudo lsof -nP -i :1397macOS
sudo lsof -nP -i :1397
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1397 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1397 netstat -ano | findstr :1397
From another machine
nmap -p 1397 -sV <host> sudo nmap -sU -p 1397 <host> nc -zv <host> 1397
Block it in the firewall
sudo ufw deny 1397/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1397" -Direction Inbound -LocalPort 1397 -Protocol TCP -Action Block # Windows
What is port 1397 used for?
Port 1397 is assigned by IANA to audio-activmail (Audio Active Mail).
Is port 1397 TCP or UDP?
Port 1397 is registered for TCP and UDP.
Is it safe to open port 1397?
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. Require TLS and authenticated submission.
How do I check if port 1397 is open?
On Linux run "ss -ltnup 'sport = :1397'", on macOS "lsof -nP -i :1397", and on Windows "netstat -ano | findstr :1397" to see the local process. From another machine, "nmap -p 1397 <host>" shows whether it is reachable.