Port 23 — Telnet
Legacy plaintext remote terminal protocol, largely replaced by SSH.
| Port number | 23 |
|---|---|
| Service | Telnet |
| Transport | TCP |
| Category | Remote Access |
Is port 23 safe?
Sends everything (including passwords) unencrypted — should not be used.
Frequently asked questions
What is port 23 used for?
Port 23 (TCP) is the standard port for Telnet. Legacy plaintext remote terminal protocol, largely replaced by SSH.
Is port 23 safe to open?
Sends everything (including passwords) unencrypted — should not be used.
Is port 23 TCP or UDP?
Port 23 commonly uses TCP.