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// Remote access

Port 4151: Men & Mice Remote Control

Port 4151 is assigned by IANA to menandmice_noh (Men & Mice Remote Control), menandmice-noh (Men & Mice Remote Control IANA assigned this well-formed service name as a replacement for "menandmice_noh".).

4151

How menandmice_noh works

Remote access
terminal:4151menandmice_noh terminal:4151menandmice_noh

The client opens a session to port 4151: each command typed is sent to the server, which runs it and returns the output.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Remote access
01 Security

Is port 4151 dangerous?

We have no specific security note for port 4151. Its risk depends on the program actually listening on it. General advice for remote access services:

  • Do not expose remote administration directly: use a VPN or a zero-trust access proxy.
  • Require MFA or key-based authentication and lock out brute-force attempts.
  • Log every login and alert on new source addresses.
02 Registry

IANA registry entries for port 4151

ServicePortTransportDescriptionReferenceUpdated
menandmice_noh 4151 TCP, UDP Men & Mice Remote Control - 2007-08-30
menandmice-noh 4151 TCP, UDP Men & Mice Remote Control IANA assigned this well-formed service name as a replacement for "menandmice_noh". - 2007-08-30

// source: IANA service name and port number registry

03 Check it

Which program uses port 4151, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4151'      # process listening on 4151
sudo lsof -nP -i :4151

macOS

sudo lsof -nP -i :4151

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4151 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4151
netstat -ano | findstr :4151

From another machine

nmap -p 4151 -sV <host>
sudo nmap -sU -p 4151 <host>
nc -zv <host> 4151

Block it in the firewall

sudo ufw deny 4151/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4151" -Direction Inbound -LocalPort 4151 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4151 used for?

Port 4151 is assigned by IANA to menandmice_noh (Men & Mice Remote Control), menandmice-noh (Men & Mice Remote Control IANA assigned this well-formed service name as a replacement for "menandmice_noh".).

Is port 4151 TCP or UDP?

Port 4151 is registered for TCP and UDP.

Is it safe to open port 4151?

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. Do not expose remote administration directly: use a VPN or a zero-trust access proxy.

How do I check if port 4151 is open?

On Linux run "ss -ltnup 'sport = :4151'", on macOS "lsof -nP -i :4151", and on Windows "netstat -ano | findstr :4151" to see the local process. From another machine, "nmap -p 4151 <host>" shows whether it is reachable.

05 Related
:22 SSH tcp · udp · sctp · moderate risk :3389 RDP tcp · udp · critical risk :23 Telnet tcp · udp · critical risk :5900 VNC tcp · udp · critical risk :5985 WinRM (HTTP) tcp · udp · high risk :5986 WinRM (HTTPS) tcp · udp · high risk :10000 Webmin tcp · udp · high risk :89 SU/MIT Telnet Gateway tcp · udp

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