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// Other services

Port 1627: T.128 Gateway

Port 1627 is assigned by IANA to t128-gateway (T.128 Gateway).

1627

How t128-gateway works

Other services
client:1627t128-gatewayresponse client:1627t128-gatewayresponse

The client sends a request to port 1627 and the t128-gateway 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 1627 dangerous?

We have no specific security note for port 1627. 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 1627

ServicePortTransportDescriptionReferenceUpdated
t128-gateway 1627 TCP, UDP T.128 Gateway - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1627, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1627'      # process listening on 1627
sudo lsof -nP -i :1627

macOS

sudo lsof -nP -i :1627

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1627 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1627
netstat -ano | findstr :1627

From another machine

nmap -p 1627 -sV <host>
sudo nmap -sU -p 1627 <host>
nc -zv <host> 1627

Block it in the firewall

sudo ufw deny 1627/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1627" -Direction Inbound -LocalPort 1627 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1627 used for?

Port 1627 is assigned by IANA to t128-gateway (T.128 Gateway).

Is port 1627 TCP or UDP?

Port 1627 is registered for TCP and UDP.

Is it safe to open port 1627?

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 1627 is open?

On Linux run "ss -ltnup 'sport = :1627'", on macOS "lsof -nP -i :1627", and on Windows "netstat -ano | findstr :1627" to see the local process. From another machine, "nmap -p 1627 <host>" shows whether it is reachable.

05 Related
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