1900
ssdp
UDP · 0x076C
Port 1900 — ssdp
Networking
Port 1900 carries SSDP (UPnP discovery) 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
- SSDP (UPnP discovery) (ssdp)
- Kind
- Networking
- Protocol
- UDP
- Range
- Registered
- Root needed
- No
- Hexadecimal
- 0x076C
- Binary
- 0000011101101100
- Two bytes
- 7 · 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 1900 used for?
SSDP (UPnP discovery) (ssdp) uses it, over UDP.
Q. Does opening port 1900 need root?
No. It is above 1023, so an ordinary user can open it.
Q. Which range does port 1900 fall in?
Registered (1024–49151). In hex it is 0x076C.
Q. Does port 1900 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.