- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 9060: CardWeb request-response I/O exchange
Port 9060 is assigned by IANA to CardWeb-IO (CardWeb request-response I/O exchange), CardWeb-RT (CardWeb realtime device data).
9060
How CardWeb-IO works
EmailMail servers hand messages to each other over port 9060, 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
- Assigned2 registered services
- Range
- Registered (1024-49151)
- Category
Is port 9060 dangerous?
We have no specific security note for port 9060. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 9060
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| CardWeb-IO | 9060 | TCP | CardWeb request-response I/O exchange | - | 2025-07-17 |
| CardWeb-RT | 9060 | UDP | CardWeb realtime device data | - | 2025-07-17 |
// source: IANA service name and port number registry
Which program uses port 9060, and is it reachable?
Linux
sudo ss -ltnup 'sport = :9060' # process listening on 9060
sudo lsof -nP -i :9060macOS
sudo lsof -nP -i :9060
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9060 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 9060 netstat -ano | findstr :9060
From another machine
nmap -p 9060 -sV <host> sudo nmap -sU -p 9060 <host> nc -zv <host> 9060
Block it in the firewall
sudo ufw deny 9060/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 9060" -Direction Inbound -LocalPort 9060 -Protocol TCP -Action Block # Windows
What is port 9060 used for?
Port 9060 is assigned by IANA to CardWeb-IO (CardWeb request-response I/O exchange), CardWeb-RT (CardWeb realtime device data).
Is port 9060 TCP or UDP?
Port 9060 is registered for TCP and UDP.
Is it safe to open port 9060?
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 9060 is open?
On Linux run "ss -ltnup 'sport = :9060'", on macOS "lsof -nP -i :9060", and on Windows "netstat -ano | findstr :9060" to see the local process. From another machine, "nmap -p 9060 <host>" shows whether it is reachable.