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// Other services

Port 660: MacOS Server Admin

Port 660 is assigned by IANA to mac-srvr-admin (MacOS Server Admin).

660

How mac-srvr-admin works

Other services
client:660mac-srvr-adminresponse client:660mac-srvr-adminresponse

The client sends a request to port 660 and the mac-srvr-admin 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 660 dangerous?

We have no specific security note for port 660. 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 660

ServicePortTransportDescriptionReferenceUpdated
mac-srvr-admin 660 TCP, UDP MacOS Server Admin - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 660, and is it reachable?

Linux

sudo ss -ltnup 'sport = :660'      # process listening on 660
sudo lsof -nP -i :660

macOS

sudo lsof -nP -i :660

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 660 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 660
netstat -ano | findstr :660

From another machine

nmap -p 660 -sV <host>
sudo nmap -sU -p 660 <host>
nc -zv <host> 660

Block it in the firewall

sudo ufw deny 660/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 660" -Direction Inbound -LocalPort 660 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 660 used for?

Port 660 is assigned by IANA to mac-srvr-admin (MacOS Server Admin).

Is port 660 TCP or UDP?

Port 660 is registered for TCP and UDP.

Is it safe to open port 660?

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 660 is open?

On Linux run "ss -ltnup 'sport = :660'", on macOS "lsof -nP -i :660", and on Windows "netstat -ano | findstr :660" to see the local process. From another machine, "nmap -p 660 <host>" shows whether it is reachable.

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