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// Other services

Port 9318: PKIX TimeStamp over TLS

Port 9318 is assigned by IANA to secure-ts (PKIX TimeStamp over TLS).

9318

How secure-ts works

Other services
client:9318#%&@!x9response? client:9318#%&@!x9response?

The client sends a request to port 9318 and the secure-ts service answers. Everything is encrypted: someone on the path only sees unreadable bytes.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
EncryptedTLS or built-in crypto
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 9318 dangerous?

We have no specific security note for port 9318. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 9318

ServicePortTransportDescriptionReferenceUpdated
secure-ts 9318 TCP, UDP PKIX TimeStamp over TLS - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 9318, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9318'      # process listening on 9318
sudo lsof -nP -i :9318

macOS

sudo lsof -nP -i :9318

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9318 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9318
netstat -ano | findstr :9318

From another machine

nmap -p 9318 -sV <host>
sudo nmap -sU -p 9318 <host>
nc -zv <host> 9318

Block it in the firewall

sudo ufw deny 9318/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9318" -Direction Inbound -LocalPort 9318 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9318 used for?

Port 9318 is assigned by IANA to secure-ts (PKIX TimeStamp over TLS).

Is port 9318 TCP or UDP?

Port 9318 is registered for TCP and UDP.

Is it safe to open port 9318?

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. Close the port if nothing on the host needs it.

How do I check if port 9318 is open?

On Linux run "ss -ltnup 'sport = :9318'", on macOS "lsof -nP -i :9318", and on Windows "netstat -ano | findstr :9318" to see the local process. From another machine, "nmap -p 9318 <host>" shows whether it is reachable.

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