5355
llmnr
TCP and UDP · 0x14EB
Port 5355 — llmnr
Name lookup
Port 5355 carries LLMNR over TCP and 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
- LLMNR (llmnr)
- Kind
- Name lookup
- Protocol
- TCP and UDP
- Range
- Registered
- Root needed
- No
- Hexadecimal
- 0x14EB
- Binary
- 0001010011101011
- Two bytes
- 20 · 235
Same kind
Turning names into addresses, or looking people and machines up.
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 5355 used for?
LLMNR (llmnr) uses it, over both TCP and UDP.
Q. Does opening port 5355 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 5355 fall in?
Registered (1024–49151). In hex it is 0x14EB.
Q. Does port 5355 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.