Port
Port 37 — Time
Port 37 (TCP) is used by Time. Legacy time protocol.
Port 37 at a glance
| Property | Value |
|---|---|
| Port number | 37 |
| Transport | TCP |
| Service | Time |
| Category | Well-known port |
What it is used for
Legacy time protocol.
Security considerations
Obsolete; use NTP (123) instead.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 37 used for?
Port 37 (TCP) is used by Time. Legacy time protocol.
Is port 37 TCP or UDP?
Port 37 uses TCP.
Is it safe to open port 37?
Obsolete; use NTP (123) instead.
Related
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