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// Databases & caches

Port 4430: REAL SQL Server

Port 4430 is assigned by IANA to rsqlserver (REAL SQL Server).

4430

How rsqlserver works

Databases & caches
app:4430rsqlserver app:4430rsqlserver

The application sends a SQL query to the rsqlserver server on port 4430, which returns rows from its tables.

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
Databases & caches
01 Security

Is port 4430 dangerous?

We have no specific security note for port 4430. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 4430

ServicePortTransportDescriptionReferenceUpdated
rsqlserver 4430 TCP, UDP REAL SQL Server - 2008-08-28

// source: IANA service name and port number registry

03 Check it

Which program uses port 4430, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4430'      # process listening on 4430
sudo lsof -nP -i :4430

macOS

sudo lsof -nP -i :4430

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4430 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4430
netstat -ano | findstr :4430

From another machine

nmap -p 4430 -sV <host>
sudo nmap -sU -p 4430 <host>
nc -zv <host> 4430

Block it in the firewall

sudo ufw deny 4430/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4430" -Direction Inbound -LocalPort 4430 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4430 used for?

Port 4430 is assigned by IANA to rsqlserver (REAL SQL Server).

Is port 4430 TCP or UDP?

Port 4430 is registered for TCP and UDP.

Is it safe to open port 4430?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 4430 is open?

On Linux run "ss -ltnup 'sport = :4430'", on macOS "lsof -nP -i :4430", and on Windows "netstat -ano | findstr :4430" to see the local process. From another machine, "nmap -p 4430 <host>" shows whether it is reachable.

05 Related
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk

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