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Port 660 (mac-srvr-admin)

IANA assigns port 660 to mac-srvr-admin: MacOS Server Admin.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mac-srvr-admin TCP MacOS Server Admin Forest Hill -
mac-srvr-admin UDP MacOS Server Admin Forest Hill -

Check what is listening on port 660

Linux: is anything listening on TCP 660?
sudo ss -tlnp 'sport = :660'
Linux: UDP 660
sudo ss -ulnp 'sport = :660'
Linux / macOS: which process owns the port
sudo lsof -nP -i :660
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':660 '
Windows (Command Prompt)
netstat -ano | findstr :660
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 660 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 660
From Windows
Test-NetConnection HOST -Port 660
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 660

Block port 660 in the firewall

ufw
sudo ufw deny 660/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 660 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 660' -Direction Inbound -Protocol TCP -LocalPort 660 -Action Block
ufw
sudo ufw deny 660/udp
iptables
sudo iptables -A INPUT -p udp --dport 660 -j DROP
nftables
sudo nft add rule inet filter input udp dport 660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 660' -Direction Inbound -Protocol UDP -LocalPort 660 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.