- 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 8442: CyBro A-bus Protocol
Port 8442 is assigned by IANA to cybro-a-bus (CyBro A-bus Protocol).
8442
How cybro-a-bus works
Other servicesThe client sends a request to port 8442 and the cybro-a-bus 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
- Registered (1024-49151)
- Category
- Other services
Is port 8442 dangerous?
We have no specific security note for port 8442. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 8442
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| cybro-a-bus | 8442 | TCP, UDP | CyBro A-bus Protocol | - | 2007-05 |
// source: IANA service name and port number registry
Which program uses port 8442, and is it reachable?
Linux
sudo ss -ltnup 'sport = :8442' # process listening on 8442
sudo lsof -nP -i :8442macOS
sudo lsof -nP -i :8442
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8442 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 8442 netstat -ano | findstr :8442
From another machine
nmap -p 8442 -sV <host> sudo nmap -sU -p 8442 <host> nc -zv <host> 8442
Block it in the firewall
sudo ufw deny 8442/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 8442" -Direction Inbound -LocalPort 8442 -Protocol TCP -Action Block # Windows
What is port 8442 used for?
Port 8442 is assigned by IANA to cybro-a-bus (CyBro A-bus Protocol).
Is port 8442 TCP or UDP?
Port 8442 is registered for TCP and UDP.
Is it safe to open port 8442?
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 8442 is open?
On Linux run "ss -ltnup 'sport = :8442'", on macOS "lsof -nP -i :8442", and on Windows "netstat -ano | findstr :8442" to see the local process. From another machine, "nmap -p 8442 <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