- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 7300: The Swiss Exchange
Port 7300 is assigned by IANA to swx (The Swiss Exchange).
7300
How swx works
EmailMail servers hand messages to each other over port 7300, one hop at a time, until the recipient's server.
- Transport
- None registered
- 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 7300 dangerous?
We have no specific security note for port 7300. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 7300
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| swx | 7300-7359 | - | The Swiss Exchange | - | - |
// source: IANA service name and port number registry
Which program uses port 7300, and is it reachable?
Linux
sudo ss -ltnup 'sport = :7300' # process listening on 7300
sudo lsof -nP -i :7300macOS
sudo lsof -nP -i :7300
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7300 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 7300 netstat -ano | findstr :7300
From another machine
nmap -p 7300 -sV <host> nc -zv <host> 7300
Block it in the firewall
sudo ufw deny 7300/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 7300" -Direction Inbound -LocalPort 7300 -Protocol TCP -Action Block # Windows
What is port 7300 used for?
Port 7300 is assigned by IANA to swx (The Swiss Exchange).
Is port 7300 TCP or UDP?
Port 7300 has no registered transport. Any program can still use it over TCP or UDP.
Is it safe to open port 7300?
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 7300 is open?
On Linux run "ss -ltnup 'sport = :7300'", on macOS "lsof -nP -i :7300", and on Windows "netstat -ano | findstr :7300" to see the local process. From another machine, "nmap -p 7300 <host>" shows whether it is reachable.