CyberHunter
Local dataset, no network
// Other services

Port 427: Server Location

Port 427 is assigned by IANA to svrloc (Server Location).

427

How svrloc works

Other services
client:427svrlocresponse client:427svrlocresponse

The client sends a request to port 427 and the svrloc 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 427 dangerous?

We have no specific security note for port 427. 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 427

ServicePortTransportDescriptionReferenceUpdated
svrloc 427 TCP, UDP Server Location - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 427, and is it reachable?

Linux

sudo ss -ltnup 'sport = :427'      # process listening on 427
sudo lsof -nP -i :427

macOS

sudo lsof -nP -i :427

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 427 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 427
netstat -ano | findstr :427

From another machine

nmap -p 427 -sV <host>
sudo nmap -sU -p 427 <host>
nc -zv <host> 427

Block it in the firewall

sudo ufw deny 427/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 427" -Direction Inbound -LocalPort 427 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 427 used for?

Port 427 is assigned by IANA to svrloc (Server Location).

Is port 427 TCP or UDP?

Port 427 is registered for TCP and UDP.

Is it safe to open port 427?

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 427 is open?

On Linux run "ss -ltnup 'sport = :427'", on macOS "lsof -nP -i :427", and on Windows "netstat -ano | findstr :427" to see the local process. From another machine, "nmap -p 427 <host>" shows whether it is reachable.

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