135
msrpc
TCP and UDP · 0x0087
Port 135 — msrpc
Networking
Port 135 carries Microsoft RPC endpoint mapper over TCP and 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
- Microsoft RPC endpoint mapper (msrpc)
- Kind
- Networking
- Protocol
- TCP and UDP
- Range
- Well-known
- Root needed
- Yes
- Hexadecimal
- 0x0087
- Binary
- 0000000010000111
- Two bytes
- 0 · 135
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 135 used for?
Microsoft RPC endpoint mapper (msrpc) uses it, over both TCP and UDP.
Q. Does opening port 135 need root?
Yes. It is at or below 1023, so on Unix only root may open it.
Q. Which range does port 135 fall in?
Well-known (0–1023). In hex it is 0x0087.
Q. Does port 135 have a twin?
Not a separate one. It either was encrypted from the start or negotiates TLS on the same number.