CyberHunter
Local dataset, no network
// Other services

Port 4445: UPNOTIFYP

Port 4445 is assigned by IANA to upnotifyp (UPNOTIFYP).

4445

How upnotifyp works

Other services
client:4445upnotifypresponse client:4445upnotifypresponse

The client sends a request to port 4445 and the upnotifyp 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
01 Security

Is port 4445 dangerous?

We have no specific security note for port 4445. Its risk depends on the program actually listening on it. General advice for other services services:

  • 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.
02 Registry

IANA registry entries for port 4445

ServicePortTransportDescriptionReferenceUpdated
upnotifyp 4445 TCP, UDP UPNOTIFYP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4445, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4445'      # process listening on 4445
sudo lsof -nP -i :4445

macOS

sudo lsof -nP -i :4445

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4445 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4445
netstat -ano | findstr :4445

From another machine

nmap -p 4445 -sV <host>
sudo nmap -sU -p 4445 <host>
nc -zv <host> 4445

Block it in the firewall

sudo ufw deny 4445/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4445" -Direction Inbound -LocalPort 4445 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4445 used for?

Port 4445 is assigned by IANA to upnotifyp (UPNOTIFYP).

Is port 4445 TCP or UDP?

Port 4445 is registered for TCP and UDP.

Is it safe to open port 4445?

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 4445 is open?

On Linux run "ss -ltnup 'sport = :4445'", on macOS "lsof -nP -i :4445", and on Windows "netstat -ano | findstr :4445" to see the local process. From another machine, "nmap -p 4445 <host>" shows whether it is reachable.

05 Related
: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

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