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// Other services

Port 1025: network blackjack

Port 1025 is assigned by IANA to blackjack (network blackjack).

1025

How blackjack works

Other services
client:1025blackjackresponse client:1025blackjackresponse

The client sends a request to port 1025 and the blackjack 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 1025 dangerous?

We have no specific security note for port 1025. 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 1025

ServicePortTransportDescriptionReferenceUpdated
blackjack 1025 TCP, UDP network blackjack - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1025, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1025'      # process listening on 1025
sudo lsof -nP -i :1025

macOS

sudo lsof -nP -i :1025

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1025 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1025
netstat -ano | findstr :1025

From another machine

nmap -p 1025 -sV <host>
sudo nmap -sU -p 1025 <host>
nc -zv <host> 1025

Block it in the firewall

sudo ufw deny 1025/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1025" -Direction Inbound -LocalPort 1025 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1025 used for?

Port 1025 is assigned by IANA to blackjack (network blackjack).

Is port 1025 TCP or UDP?

Port 1025 is registered for TCP and UDP.

Is it safe to open port 1025?

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 1025 is open?

On Linux run "ss -ltnup 'sport = :1025'", on macOS "lsof -nP -i :1025", and on Windows "netstat -ano | findstr :1025" to see the local process. From another machine, "nmap -p 1025 <host>" shows whether it is reachable.

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