- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 5429: Billing and Accounting System Exchange
Port 5429 is assigned by IANA to base (Billing and Accounting System Exchange).
5429
How base works
EmailMail servers hand messages to each other over port 5429, 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 5429 dangerous?
We have no specific security note for port 5429. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 5429
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| base | 5429 | TCP, UDP | Billing and Accounting System Exchange | - | - |
// source: IANA service name and port number registry
Which program uses port 5429, and is it reachable?
Linux
sudo ss -ltnup 'sport = :5429' # process listening on 5429
sudo lsof -nP -i :5429macOS
sudo lsof -nP -i :5429
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5429 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 5429 netstat -ano | findstr :5429
From another machine
nmap -p 5429 -sV <host> sudo nmap -sU -p 5429 <host> nc -zv <host> 5429
Block it in the firewall
sudo ufw deny 5429/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 5429" -Direction Inbound -LocalPort 5429 -Protocol TCP -Action Block # Windows
What is port 5429 used for?
Port 5429 is assigned by IANA to base (Billing and Accounting System Exchange).
Is port 5429 TCP or UDP?
Port 5429 is registered for TCP and UDP.
Is it safe to open port 5429?
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 5429 is open?
On Linux run "ss -ltnup 'sport = :5429'", on macOS "lsof -nP -i :5429", and on Windows "netstat -ano | findstr :5429" to see the local process. From another machine, "nmap -p 5429 <host>" shows whether it is reachable.