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// Directory & authentication

Port 472: ljk-login

Port 472 is assigned by IANA to ljk-login (ljk-login).

472

How ljk-login works

Directory & authentication
userdirectoryljk-loginresponse userdirectoryljk-loginresponse

The client proves who it is on port 472 and gets an answer (or a ticket) it can use with other services.

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
Directory & authentication
01 Security

Is port 472 dangerous?

We have no specific security note for port 472. Its risk depends on the program actually listening on it. General advice for directory & authentication services:

  • Keep directory and authentication services on internal networks.
  • Require signing or TLS and disable anonymous queries.
  • Monitor authentication failures for spraying and brute force.
02 Registry

IANA registry entries for port 472

ServicePortTransportDescriptionReferenceUpdated
ljk-login 472 TCP, UDP ljk-login - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 472, and is it reachable?

Linux

sudo ss -ltnup 'sport = :472'      # process listening on 472
sudo lsof -nP -i :472

macOS

sudo lsof -nP -i :472

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 472 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 472
netstat -ano | findstr :472

From another machine

nmap -p 472 -sV <host>
sudo nmap -sU -p 472 <host>
nc -zv <host> 472

Block it in the firewall

sudo ufw deny 472/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 472" -Direction Inbound -LocalPort 472 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 472 used for?

Port 472 is assigned by IANA to ljk-login (ljk-login).

Is port 472 TCP or UDP?

Port 472 is registered for TCP and UDP.

Is it safe to open port 472?

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. Keep directory and authentication services on internal networks.

How do I check if port 472 is open?

On Linux run "ss -ltnup 'sport = :472'", on macOS "lsof -nP -i :472", and on Windows "netstat -ano | findstr :472" to see the local process. From another machine, "nmap -p 472 <host>" shows whether it is reachable.

05 Related
:389 LDAP tcp · udp · high risk :636 LDAPS tcp · udp · moderate risk :88 Kerberos tcp · udp · high risk :3268 Global Catalog (LDAP) tcp · udp · high risk :1812 RADIUS udp · tcp · moderate risk :31 MSG Authentication tcp · udp :49 Login Host Protocol (TACACS) tcp · udp :56 XNS Authentication tcp · udp

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