1813
radius-acct
UDP · 0x0715
Port 1813 — radius-acct
Authentication
Port 1813 carries RADIUS accounting over UDP. 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
- RADIUS accounting (radius-acct)
- Kind
- Authentication
- Protocol
- UDP
- Range
- Registered
- Root needed
- No
- Hexadecimal
- 0x0715
- Binary
- 0000011100010101
- Two bytes
- 7 · 21
Same kind
Checking who you are and handing out keys.
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 1813 used for?
RADIUS accounting (radius-acct) uses it, over UDP.
Q. Does opening port 1813 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 1813 fall in?
Registered (1024–49151). In hex it is 0x0715.
Q. Does port 1813 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.