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// Databases & caches

Port 1527: oracle

Port 1527 is assigned by IANA to tlisrv (oracle).

1527

How tlisrv works

Databases & caches
app:1527tlisrv app:1527tlisrv

The application sends a SQL query to the tlisrv server on port 1527, 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 1527 dangerous?

We have no specific security note for port 1527. 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 1527

ServicePortTransportDescriptionReferenceUpdated
tlisrv 1527 TCP, UDP oracle - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1527, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1527'      # process listening on 1527
sudo lsof -nP -i :1527

macOS

sudo lsof -nP -i :1527

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1527 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1527
netstat -ano | findstr :1527

From another machine

nmap -p 1527 -sV <host>
sudo nmap -sU -p 1527 <host>
nc -zv <host> 1527

Block it in the firewall

sudo ufw deny 1527/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1527" -Direction Inbound -LocalPort 1527 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1527 used for?

Port 1527 is assigned by IANA to tlisrv (oracle).

Is port 1527 TCP or UDP?

Port 1527 is registered for TCP and UDP.

Is it safe to open port 1527?

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 1527 is open?

On Linux run "ss -ltnup 'sport = :1527'", on macOS "lsof -nP -i :1527", and on Windows "netstat -ano | findstr :1527" to see the local process. From another machine, "nmap -p 1527 <host>" shows whether it is reachable.

05 Related
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