546
dhcpv6-client
UDP · 0x0222
Port 546 — dhcpv6-client
Networking
Port 546 carries DHCPv6 client over UDP. 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
- DHCPv6 client (dhcpv6-client)
- Kind
- Networking
- Protocol
- UDP
- Range
- Well-known
- Root needed
- Yes
- Hexadecimal
- 0x0222
- Binary
- 0000001000100010
- Two bytes
- 2 · 34
Same kind
Running the network itself — handing out addresses, announcing routes, digging tunnels.
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 546 used for?
DHCPv6 client (dhcpv6-client) uses it, over UDP.
Q. Does opening port 546 need root?
Yes. It is at or below 1023, so on Unix only root may open it.
Q. Which range does port 546 fall in?
Well-known (0–1023). In hex it is 0x0222.
Q. Does port 546 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.