- 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 142: Britton-Lee IDM
Port 142 is assigned by IANA to bl-idm (Britton-Lee IDM).
142
How bl-idm works
Other servicesThe client sends a request to port 142 and the bl-idm 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 142 dangerous?
We have no specific security note for port 142. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 142
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| bl-idm | 142 | TCP, UDP | Britton-Lee IDM | - | - |
// source: IANA service name and port number registry
Which program uses port 142, and is it reachable?
Linux
sudo ss -ltnup 'sport = :142' # process listening on 142
sudo lsof -nP -i :142macOS
sudo lsof -nP -i :142
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 142 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 142 netstat -ano | findstr :142
From another machine
nmap -p 142 -sV <host> sudo nmap -sU -p 142 <host> nc -zv <host> 142
Block it in the firewall
sudo ufw deny 142/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 142" -Direction Inbound -LocalPort 142 -Protocol TCP -Action Block # Windows
What is port 142 used for?
Port 142 is assigned by IANA to bl-idm (Britton-Lee IDM).
Is port 142 TCP or UDP?
Port 142 is registered for TCP and UDP.
Is it safe to open port 142?
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 142 is open?
On Linux run "ss -ltnup 'sport = :142'", on macOS "lsof -nP -i :142", and on Windows "netstat -ano | findstr :142" to see the local process. From another machine, "nmap -p 142 <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