- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 28589: Building operating system services wide area verified exchange
Port 28589 is assigned by IANA to bosswave (Building operating system services wide area verified exchange).
28589
How bosswave works
EmailMail servers hand messages to each other over port 28589, one hop at a time, until the recipient's server.
- Transport
- TCP
- 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 28589 dangerous?
We have no specific security note for port 28589. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 28589
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| bosswave | 28589 | TCP | Building operating system services wide area verified exchange | - | 2016-06-13 |
| - | 28589 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 28589, and is it reachable?
Linux
sudo ss -ltnup 'sport = :28589' # process listening on 28589
sudo lsof -nP -i :28589macOS
sudo lsof -nP -i :28589
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 28589 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 28589 netstat -ano | findstr :28589
From another machine
nmap -p 28589 -sV <host> nc -zv <host> 28589
Block it in the firewall
sudo ufw deny 28589/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 28589" -Direction Inbound -LocalPort 28589 -Protocol TCP -Action Block # Windows
What is port 28589 used for?
Port 28589 is assigned by IANA to bosswave (Building operating system services wide area verified exchange).
Is port 28589 TCP or UDP?
Port 28589 is registered for TCP.
Is it safe to open port 28589?
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 28589 is open?
On Linux run "ss -ltnup 'sport = :28589'", on macOS "lsof -nP -i :28589", and on Windows "netstat -ano | findstr :28589" to see the local process. From another machine, "nmap -p 28589 <host>" shows whether it is reachable.