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Port 1688: KMS activation

Common Ports Reference: What runs on port 3389, 445 or 5985: common TCP and UDP ports for web, mail, Windows, AD, databases and VPNs, with security notes.

The ports that come up when opening a firewall, reading a scan or troubleshooting a connection: what runs on each, TCP or UDP, and what to watch out for. Search by number or name. Port numbers and service names were checked against IANA's port number registry; ports that are widely used but assigned by IANA to something else are marked unofficial.

Port number or name

1688 is a registered port (1024-49151): assigned by IANA on request. IANA's registry lists everything assigned to it: look up 1688 at IANA.

1 of 96 ports

What a domain controller and Windows servers listen on.

PortProtocolServiceWhat it's forIANA name
1688
TCP
KMS activation
Key Management Service for volume activation of Windows and Office. Unofficial.
unofficial

Is port 1688 open on your network? Check it → · All common ports →