CyberHunter
Local dataset, no network
// Other services

Port 527: Stock IXChange

Port 527 is assigned by IANA to stx (Stock IXChange).

527

How stx works

Other services
client:527stxresponse client:527stxresponse

The client sends a request to port 527 and the stx 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 527 dangerous?

We have no specific security note for port 527. 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 527

ServicePortTransportDescriptionReferenceUpdated
stx 527 TCP, UDP Stock IXChange - 2022-01-25

// source: IANA service name and port number registry

03 Check it

Which program uses port 527, and is it reachable?

Linux

sudo ss -ltnup 'sport = :527'      # process listening on 527
sudo lsof -nP -i :527

macOS

sudo lsof -nP -i :527

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 527 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 527
netstat -ano | findstr :527

From another machine

nmap -p 527 -sV <host>
sudo nmap -sU -p 527 <host>
nc -zv <host> 527

Block it in the firewall

sudo ufw deny 527/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 527" -Direction Inbound -LocalPort 527 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 527 used for?

Port 527 is assigned by IANA to stx (Stock IXChange).

Is port 527 TCP or UDP?

Port 527 is registered for TCP and UDP.

Is it safe to open port 527?

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 527 is open?

On Linux run "ss -ltnup 'sport = :527'", on macOS "lsof -nP -i :527", and on Windows "netstat -ano | findstr :527" to see the local process. From another machine, "nmap -p 527 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news