8443
https-alt
TCP · 0x20FB
Port 8443 — https-alt
Web
Port 8443 carries Alternate web port over TLS 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
- Alternate web port over TLS (https-alt)
- Kind
- Web
- Protocol
- TCP
- Range
- Registered
- Root needed
- No
- Hexadecimal
- 0x20FB
- Binary
- 0010000011111011
- Two bytes
- 32 · 251
- Plain twin
- 8080
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 8443 used for?
Alternate web port over TLS (https-alt) uses it, over TCP.
Q. Does opening port 8443 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 8443 fall in?
Registered (1024–49151). In hex it is 0x20FB.
Q. What does port 8443 wrap?
It is port 8080 wrapped in TLS.