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// Network services

Port 6487: Service Registry Default IIOPAuth Domain

Port 6487 is assigned by IANA to sun-sr-iiop-aut (Service Registry Default IIOPAuth Domain).

6487

How sun-sr-iiop-aut works

Network services
client:6487sun-sr-iiop-autresponse client:6487sun-sr-iiop-autresponse

The client sends a request to port 6487 and the sun-sr-iiop-aut 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
Network services
01 Security

Is port 6487 dangerous?

We have no specific security note for port 6487. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 6487

ServicePortTransportDescriptionReferenceUpdated
sun-sr-iiop-aut 6487 TCP, UDP Service Registry Default IIOPAuth Domain - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 6487, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6487'      # process listening on 6487
sudo lsof -nP -i :6487

macOS

sudo lsof -nP -i :6487

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6487 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6487
netstat -ano | findstr :6487

From another machine

nmap -p 6487 -sV <host>
sudo nmap -sU -p 6487 <host>
nc -zv <host> 6487

Block it in the firewall

sudo ufw deny 6487/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6487" -Direction Inbound -LocalPort 6487 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6487 used for?

Port 6487 is assigned by IANA to sun-sr-iiop-aut (Service Registry Default IIOPAuth Domain).

Is port 6487 TCP or UDP?

Port 6487 is registered for TCP and UDP.

Is it safe to open port 6487?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 6487 is open?

On Linux run "ss -ltnup 'sport = :6487'", on macOS "lsof -nP -i :6487", and on Windows "netstat -ano | findstr :6487" to see the local process. From another machine, "nmap -p 6487 <host>" shows whether it is reachable.

05 Related
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