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// Directory & authentication

Port 464: kpasswd

Port 464 is assigned by IANA to kpasswd (kpasswd).

464

How kpasswd works

Directory & authentication
userdirectorykpasswdresponse userdirectorykpasswdresponse

The client proves who it is on port 464 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 464 dangerous?

We have no specific security note for port 464. 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 464

ServicePortTransportDescriptionReferenceUpdated
kpasswd 464 TCP, UDP kpasswd - 2023-11-17

// source: IANA service name and port number registry

03 Check it

Which program uses port 464, and is it reachable?

Linux

sudo ss -ltnup 'sport = :464'      # process listening on 464
sudo lsof -nP -i :464

macOS

sudo lsof -nP -i :464

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 464 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 464
netstat -ano | findstr :464

From another machine

nmap -p 464 -sV <host>
sudo nmap -sU -p 464 <host>
nc -zv <host> 464

Block it in the firewall

sudo ufw deny 464/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 464" -Direction Inbound -LocalPort 464 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 464 used for?

Port 464 is assigned by IANA to kpasswd (kpasswd).

Is port 464 TCP or UDP?

Port 464 is registered for TCP and UDP.

Is it safe to open port 464?

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 464 is open?

On Linux run "ss -ltnup 'sport = :464'", on macOS "lsof -nP -i :464", and on Windows "netstat -ano | findstr :464" to see the local process. From another machine, "nmap -p 464 <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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