- 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.
Port 405: ncld
Port 405 is assigned by IANA to ncld (ncld).
405
How ncld works
Other servicesThe client sends a request to port 405 and the ncld 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
Is port 405 dangerous?
We have no specific security note for port 405. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 405
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| ncld | 405 | TCP, UDP | ncld | - | - |
// source: IANA service name and port number registry
Which program uses port 405, and is it reachable?
Linux
sudo ss -ltnup 'sport = :405' # process listening on 405
sudo lsof -nP -i :405macOS
sudo lsof -nP -i :405
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 405 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 405 netstat -ano | findstr :405
From another machine
nmap -p 405 -sV <host> sudo nmap -sU -p 405 <host> nc -zv <host> 405
Block it in the firewall
sudo ufw deny 405/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 405" -Direction Inbound -LocalPort 405 -Protocol TCP -Action Block # Windows
What is port 405 used for?
Port 405 is assigned by IANA to ncld (ncld).
Is port 405 TCP or UDP?
Port 405 is registered for TCP and UDP.
Is it safe to open port 405?
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 405 is open?
On Linux run "ss -ltnup 'sport = :405'", on macOS "lsof -nP -i :405", and on Windows "netstat -ano | findstr :405" to see the local process. From another machine, "nmap -p 405 <host>" shows whether it is reachable.
Other other services ports
: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