5900
vnc
TCP · 0x170C
Port 5900 — vnc
Remote access
Port 5900 carries VNC screen sharing over TCP. 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
- VNC screen sharing (vnc)
- Kind
- Remote access
- Protocol
- TCP
- Range
- Registered
- Root needed
- No
- Hexadecimal
- 0x170C
- Binary
- 0001011100001100
- Two bytes
- 23 · 12
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 5900 used for?
VNC screen sharing (vnc) uses it, over TCP.
Q. Does opening port 5900 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 5900 fall in?
Registered (1024–49151). In hex it is 0x170C.
Q. Does port 5900 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.