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// Network services

Port 6488: Service Registry Default JMX Domain

Port 6488 is assigned by IANA to sun-sr-jmx (Service Registry Default JMX Domain).

6488

How sun-sr-jmx works

Network services
client:6488sun-sr-jmxresponse client:6488sun-sr-jmxresponse

The client sends a request to port 6488 and the sun-sr-jmx 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 6488 dangerous?

We have no specific security note for port 6488. 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 6488

ServicePortTransportDescriptionReferenceUpdated
sun-sr-jmx 6488 TCP, UDP Service Registry Default JMX Domain - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 6488, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6488'      # process listening on 6488
sudo lsof -nP -i :6488

macOS

sudo lsof -nP -i :6488

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6488 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6488
netstat -ano | findstr :6488

From another machine

nmap -p 6488 -sV <host>
sudo nmap -sU -p 6488 <host>
nc -zv <host> 6488

Block it in the firewall

sudo ufw deny 6488/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6488" -Direction Inbound -LocalPort 6488 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6488 used for?

Port 6488 is assigned by IANA to sun-sr-jmx (Service Registry Default JMX Domain).

Is port 6488 TCP or UDP?

Port 6488 is registered for TCP and UDP.

Is it safe to open port 6488?

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 6488 is open?

On Linux run "ss -ltnup 'sport = :6488'", on macOS "lsof -nP -i :6488", and on Windows "netstat -ano | findstr :6488" to see the local process. From another machine, "nmap -p 6488 <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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