995
pop3s
TCP · 0x03E3
Port 995 — pop3s
Port 995 carries Mail retrieval 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
- Mail retrieval over TLS (pop3s)
- Kind
- Protocol
- TCP
- Range
- Well-known
- Root needed
- Yes
- Hexadecimal
- 0x03E3
- Binary
- 0000001111100011
- Two bytes
- 3 · 227
- Plain twin
- 110
Same kind
Sending mail out and fetching it back.
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 995 used for?
Mail retrieval over TLS (pop3s) uses it, over TCP.
Q. Does opening port 995 need root?
Yes. It is at or below 1023, so on Unix only root may open it.
Q. Which range does port 995 fall in?
Well-known (0–1023). In hex it is 0x03E3.
Q. What does port 995 wrap?
It is port 110 wrapped in TLS.