3389
rdp
TCP and UDP · 0x0D3D
Port 3389 — rdp
Remote access
Port 3389 carries Remote Desktop over TCP and UDP. Above 1023, so an ordinary user can open it.
1024–49151. Meant to be applied for, though some numbers here are custom by habit.
Where it sits in 65535
A port number is 16 bits, so it stops at 65535. The narrow band at the left is everything up to 1023.
065535
- Service
- Remote Desktop (rdp)
- Kind
- Remote access
- Protocol
- TCP and UDP
- Range
- Registered
- Root needed
- No
- Hexadecimal
- 0x0D3D
- Binary
- 0000110100111101
- Two bytes
- 13 · 61
Same kind
Running commands or watching a screen on someone else’s machine.
Ports next to it
How to read this
- A port number is 16 bits, so it runs 0 to 65535. There is no port 65536.
- Opening anything at or below 1023 needs root on Unix.
- Plain and encrypted often live on different numbers — 80 and 443, for one.
- Numbers like 3000 and 8080 were never registered; those are marked as custom.
Frequently asked questions
Q. What is port 3389 used for?
Remote Desktop (rdp) uses it, over both TCP and UDP.
Q. Does opening port 3389 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 3389 fall in?
Registered (1024–49151). In hex it is 0x0D3D.
Q. Does port 3389 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.