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// Other services

Port 379: TIA/EIA/IS-99 modem client

Port 379 is assigned by IANA to is99c (TIA/EIA/IS-99 modem client).

379

How is99c works

Other services
client:379is99cresponse client:379is99cresponse

The client sends a request to port 379 and the is99c 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 379 dangerous?

We have no specific security note for port 379. 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 379

ServicePortTransportDescriptionReferenceUpdated
is99c 379 TCP, UDP TIA/EIA/IS-99 modem client - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 379, and is it reachable?

Linux

sudo ss -ltnup 'sport = :379'      # process listening on 379
sudo lsof -nP -i :379

macOS

sudo lsof -nP -i :379

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 379 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 379
netstat -ano | findstr :379

From another machine

nmap -p 379 -sV <host>
sudo nmap -sU -p 379 <host>
nc -zv <host> 379

Block it in the firewall

sudo ufw deny 379/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 379" -Direction Inbound -LocalPort 379 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 379 used for?

Port 379 is assigned by IANA to is99c (TIA/EIA/IS-99 modem client).

Is port 379 TCP or UDP?

Port 379 is registered for TCP and UDP.

Is it safe to open port 379?

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 379 is open?

On Linux run "ss -ltnup 'sport = :379'", on macOS "lsof -nP -i :379", and on Windows "netstat -ano | findstr :379" to see the local process. From another machine, "nmap -p 379 <host>" shows whether it is reachable.

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