CyberHunter
Local dataset, no network
// Other services

Port 318: PKIX TimeStamp

Port 318 is assigned by IANA to pkix-timestamp (PKIX TimeStamp).

318

How pkix-timestamp works

Other services
client:318pkix-timestampresponse client:318pkix-timestampresponse

The client sends a request to port 318 and the pkix-timestamp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 318 dangerous?

We have no specific security note for port 318. 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 318

ServicePortTransportDescriptionReferenceUpdated
pkix-timestamp 318 TCP, UDP PKIX TimeStamp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 318, and is it reachable?

Linux

sudo ss -ltnup 'sport = :318'      # process listening on 318
sudo lsof -nP -i :318

macOS

sudo lsof -nP -i :318

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 318 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 318
netstat -ano | findstr :318

From another machine

nmap -p 318 -sV <host>
sudo nmap -sU -p 318 <host>
nc -zv <host> 318

Block it in the firewall

sudo ufw deny 318/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 318" -Direction Inbound -LocalPort 318 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 318 used for?

Port 318 is assigned by IANA to pkix-timestamp (PKIX TimeStamp).

Is port 318 TCP or UDP?

Port 318 is registered for TCP and UDP.

Is it safe to open port 318?

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 318 is open?

On Linux run "ss -ltnup 'sport = :318'", on macOS "lsof -nP -i :318", and on Windows "netstat -ano | findstr :318" to see the local process. From another machine, "nmap -p 318 <host>" shows whether it is reachable.

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