51820
wireguard
UDP · 0xCA6C
Port 51820 — wireguard
Networking
Port 51820 carries WireGuard over UDP. Above 1023, so an ordinary user can open it.
49152–65535. The operating system picks from here for each outgoing connection, so nobody owns them.
By custom · Not a registered number but one settled by habit. Another program may well have taken it first.
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
- WireGuard (wireguard)
- Kind
- Networking
- Protocol
- UDP
- Range
- Dynamic
- Root needed
- No
- Hexadecimal
- 0xCA6C
- Binary
- 1100101001101100
- Two bytes
- 202 · 108
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 51820 used for?
WireGuard (wireguard) uses it, over UDP.
Q. Does opening port 51820 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 51820 fall in?
Dynamic (49152–65535). In hex it is 0xCA6C.
Q. Does port 51820 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.