Port 719 exists, but nobody lives there.
What Range This Port Belongs To
Port 719 sits in the well-known ports range (0-1023), also called system ports. This is the most privileged range in the Internet's port system. These ports are assigned by IANA (Internet Assigned Numbers Authority) through strict procedures requiring IETF Review or IESG Approval.1
On Unix-like systems, only processes with superuser privileges can bind to ports in this range. It's the Internet's restricted neighborhood—ports 80 (HTTP), 443 (HTTPS), 22 (SSH), and 25 (SMTP) all live here.
But port 719? Officially unassigned.2
What This Means
The well-known ports range is the smallest and most densely assigned range. Getting a port assigned here requires meeting strict requirements because space is limited and the range is historically significant.
Port 719 being unassigned doesn't mean it's broken or useless. It means IANA hasn't allocated it to any specific protocol or service. The space is reserved, waiting.
How to Check What's Listening
Even though port 719 has no official assignment, something could still be using it on your system. To check:
On Linux/Mac:
On Windows:
If you find something listening on port 719, it's using the port unofficially—either a custom application, internal tool, or service that chose this port specifically because it's unassigned.
Why Unassigned Ports Matter
Unassigned ports aren't wasted space. They serve several purposes:
Reserved for future protocols — As new Internet protocols are developed, they need port numbers. Unassigned ports in the well-known range are available for truly essential services that warrant system-level privileges.
Private use — Organizations can use unassigned ports for internal applications without conflicting with standard services. Port 719 might run a custom monitoring tool in a corporate network because it won't collide with anything public.
Flexibility — Not every port needs an assignment. The gaps between assigned ports give the Internet room to grow without constant reorganization.
The Reality
Port 719 is an empty apartment in the Internet's most exclusive building. The address exists. The door is real. But when you knock, nobody answers—unless someone unofficially moved in without IANA's permission.
Most ports are like this. The Internet's port system has 65,535 addresses. Only a fraction are officially assigned. The rest wait quietly, available when needed, serving purposes we haven't invented yet.
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