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// Other services

Port 145: UAAC Protocol

Port 145 is assigned by IANA to uaac (UAAC Protocol).

145

How uaac works

Other services
client:145uaacresponse client:145uaacresponse

The client sends a request to port 145 and the uaac 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
01 Security

Is port 145 dangerous?

We have no specific security note for port 145. 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 145

ServicePortTransportDescriptionReferenceUpdated
uaac 145 TCP, UDP UAAC Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 145, and is it reachable?

Linux

sudo ss -ltnup 'sport = :145'      # process listening on 145
sudo lsof -nP -i :145

macOS

sudo lsof -nP -i :145

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 145 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 145
netstat -ano | findstr :145

From another machine

nmap -p 145 -sV <host>
sudo nmap -sU -p 145 <host>
nc -zv <host> 145

Block it in the firewall

sudo ufw deny 145/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 145" -Direction Inbound -LocalPort 145 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 145 used for?

Port 145 is assigned by IANA to uaac (UAAC Protocol).

Is port 145 TCP or UDP?

Port 145 is registered for TCP and UDP.

Is it safe to open port 145?

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 145 is open?

On Linux run "ss -ltnup 'sport = :145'", on macOS "lsof -nP -i :145", and on Windows "netstat -ano | findstr :145" to see the local process. From another machine, "nmap -p 145 <host>" shows whether it is reachable.

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