CyberHunter
Local dataset, no network
// Other services

Port 687: asipregistry

Port 687 is assigned by IANA to asipregistry (asipregistry).

687

How asipregistry works

Other services
client:687asipregistryresponse client:687asipregistryresponse

The client sends a request to port 687 and the asipregistry 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 687 dangerous?

We have no specific security note for port 687. 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 687

ServicePortTransportDescriptionReferenceUpdated
asipregistry 687 TCP, UDP asipregistry - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 687, and is it reachable?

Linux

sudo ss -ltnup 'sport = :687'      # process listening on 687
sudo lsof -nP -i :687

macOS

sudo lsof -nP -i :687

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 687 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 687
netstat -ano | findstr :687

From another machine

nmap -p 687 -sV <host>
sudo nmap -sU -p 687 <host>
nc -zv <host> 687

Block it in the firewall

sudo ufw deny 687/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 687" -Direction Inbound -LocalPort 687 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 687 used for?

Port 687 is assigned by IANA to asipregistry (asipregistry).

Is port 687 TCP or UDP?

Port 687 is registered for TCP and UDP.

Is it safe to open port 687?

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 687 is open?

On Linux run "ss -ltnup 'sport = :687'", on macOS "lsof -nP -i :687", and on Windows "netstat -ano | findstr :687" to see the local process. From another machine, "nmap -p 687 <host>" shows whether it is reachable.

05 Related
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