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// Other services

Port 380: TIA/EIA/IS-99 modem server

Port 380 is assigned by IANA to is99s (TIA/EIA/IS-99 modem server).

380

How is99s works

Other services
client:380is99sresponse client:380is99sresponse

The client sends a request to port 380 and the is99s 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 380 dangerous?

We have no specific security note for port 380. 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 380

ServicePortTransportDescriptionReferenceUpdated
is99s 380 TCP, UDP TIA/EIA/IS-99 modem server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 380, and is it reachable?

Linux

sudo ss -ltnup 'sport = :380'      # process listening on 380
sudo lsof -nP -i :380

macOS

sudo lsof -nP -i :380

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 380 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 380
netstat -ano | findstr :380

From another machine

nmap -p 380 -sV <host>
sudo nmap -sU -p 380 <host>
nc -zv <host> 380

Block it in the firewall

sudo ufw deny 380/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 380" -Direction Inbound -LocalPort 380 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 380 used for?

Port 380 is assigned by IANA to is99s (TIA/EIA/IS-99 modem server).

Is port 380 TCP or UDP?

Port 380 is registered for TCP and UDP.

Is it safe to open port 380?

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 380 is open?

On Linux run "ss -ltnup 'sport = :380'", on macOS "lsof -nP -i :380", and on Windows "netstat -ano | findstr :380" to see the local process. From another machine, "nmap -p 380 <host>" shows whether it is reachable.

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