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// Network services

Port 6486: Service Registry Default IIOPS Domain

Port 6486 is assigned by IANA to sun-sr-iiops (Service Registry Default IIOPS Domain).

6486

How sun-sr-iiops works

Network services
client:6486sun-sr-iiopsresponse client:6486sun-sr-iiopsresponse

The client sends a request to port 6486 and the sun-sr-iiops 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 6486 dangerous?

We have no specific security note for port 6486. 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 6486

ServicePortTransportDescriptionReferenceUpdated
sun-sr-iiops 6486 TCP, UDP Service Registry Default IIOPS Domain - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 6486, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6486'      # process listening on 6486
sudo lsof -nP -i :6486

macOS

sudo lsof -nP -i :6486

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6486 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6486
netstat -ano | findstr :6486

From another machine

nmap -p 6486 -sV <host>
sudo nmap -sU -p 6486 <host>
nc -zv <host> 6486

Block it in the firewall

sudo ufw deny 6486/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6486" -Direction Inbound -LocalPort 6486 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6486 used for?

Port 6486 is assigned by IANA to sun-sr-iiops (Service Registry Default IIOPS Domain).

Is port 6486 TCP or UDP?

Port 6486 is registered for TCP and UDP.

Is it safe to open port 6486?

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 6486 is open?

On Linux run "ss -ltnup 'sport = :6486'", on macOS "lsof -nP -i :6486", and on Windows "netstat -ano | findstr :6486" to see the local process. From another machine, "nmap -p 6486 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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