443
https
TCP · 0x01BB
Port 443 — https
Web
Port 443 carries Web over TLS over TCP. Being at or below 1023, only root may open it on Unix.
0–1023. On Unix only root may open one.
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
- Web over TLS (https)
- Kind
- Web
- Protocol
- TCP
- Range
- Well-known
- Root needed
- Yes
- Hexadecimal
- 0x01BB
- Binary
- 0000000110111011
- Two bytes
- 1 · 187
- Plain twin
- 80
Same kind
Where a browser knocks.
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 443 used for?
Web over TLS (https) uses it, over TCP.
Q. Does opening port 443 need root?
Yes. It is at or below 1023, so on Unix only root may open it.
Q. Which range does port 443 fall in?
Well-known (0–1023). In hex it is 0x01BB.
Q. What does port 443 wrap?
It is port 80 wrapped in TLS.