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// Other services

Port 1528: Not Only a Routeing Protocol

Port 1528 is assigned by IANA to norp (Not Only a Routeing Protocol).

1528

How norp works

Other services
client:1528norpresponse client:1528norpresponse

The client sends a request to port 1528 and the norp service answers.

Transport
TCP · UDP · SCTP
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 1528 dangerous?

We have no specific security note for port 1528. 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 1528

ServicePortTransportDescriptionReferenceUpdated
norp 1528 TCP, UDP, SCTP Not Only a Routeing Protocol - 2021-04-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 1528, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1528'      # process listening on 1528
sudo lsof -nP -i :1528

macOS

sudo lsof -nP -i :1528

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1528 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1528
netstat -ano | findstr :1528

From another machine

nmap -p 1528 -sV <host>
sudo nmap -sU -p 1528 <host>
nc -zv <host> 1528

Block it in the firewall

sudo ufw deny 1528/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1528" -Direction Inbound -LocalPort 1528 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1528 used for?

Port 1528 is assigned by IANA to norp (Not Only a Routeing Protocol).

Is port 1528 TCP or UDP?

Port 1528 is registered for TCP and UDP and SCTP.

Is it safe to open port 1528?

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 1528 is open?

On Linux run "ss -ltnup 'sport = :1528'", on macOS "lsof -nP -i :1528", and on Windows "netstat -ano | findstr :1528" to see the local process. From another machine, "nmap -p 1528 <host>" shows whether it is reachable.

05 Related
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