990
ftps
TCP · 0x03DE
Port 990 — ftps
Files
Port 990 carries FTP 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
- FTP over TLS (ftps)
- Kind
- Files
- Protocol
- TCP
- Range
- Well-known
- Root needed
- Yes
- Hexadecimal
- 0x03DE
- Binary
- 0000001111011110
- Two bytes
- 3 · 222
- Plain twin
- 21
Same kind
Moving files about, or sharing a disk.
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 990 used for?
FTP over TLS (ftps) uses it, over TCP.
Q. Does opening port 990 need root?
Yes. It is at or below 1023, so on Unix only root may open it.
Q. Which range does port 990 fall in?
Well-known (0–1023). In hex it is 0x03DE.
Q. What does port 990 wrap?
It is port 21 wrapped in TLS.