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// Other services

Port 1526: Prospero Data Access Prot non-priv

Port 1526 is assigned by IANA to pdap-np (Prospero Data Access Prot non-priv).

1526

How pdap-np works

Other services
client:1526pdap-npresponse client:1526pdap-npresponse

The client sends a request to port 1526 and the pdap-np 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 1526 dangerous?

We have no specific security note for port 1526. 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 1526

ServicePortTransportDescriptionReferenceUpdated
pdap-np 1526 TCP, UDP Prospero Data Access Prot non-priv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1526, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1526'      # process listening on 1526
sudo lsof -nP -i :1526

macOS

sudo lsof -nP -i :1526

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1526 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1526
netstat -ano | findstr :1526

From another machine

nmap -p 1526 -sV <host>
sudo nmap -sU -p 1526 <host>
nc -zv <host> 1526

Block it in the firewall

sudo ufw deny 1526/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1526" -Direction Inbound -LocalPort 1526 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1526 used for?

Port 1526 is assigned by IANA to pdap-np (Prospero Data Access Prot non-priv).

Is port 1526 TCP or UDP?

Port 1526 is registered for TCP and UDP.

Is it safe to open port 1526?

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 1526 is open?

On Linux run "ss -ltnup 'sport = :1526'", on macOS "lsof -nP -i :1526", and on Windows "netstat -ano | findstr :1526" to see the local process. From another machine, "nmap -p 1526 <host>" shows whether it is reachable.

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