> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.krkn.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Port

# port

Port scanning and banner grabbing.

***

## Usage

```text theme={null}
r4t port <subcommand> <target> <port> [flags]
```

***

## Subcommands

### `port scan`

Check whether a specific port is open on a target host.

```bash theme={null}
# Check if port 445 is open (TCP)
r4t port scan 10.10.10.10 445

# Check a UDP port
r4t port scan 10.10.10.10 161 --udp
```

| Flag    | Short | Description            |
| ------- | ----- | ---------------------- |
| `--udp` | `-U`  | Use UDP instead of TCP |

Returns open/closed/filtered status.

***

### `port banner`

Connect to a port and retrieve its service banner.

```bash theme={null}
# Grab the banner from port 22
r4t port banner 10.10.10.10 22

# Grab banner via UDP
r4t port banner 10.10.10.10 161 --udp
```

| Flag    | Short | Description            |
| ------- | ----- | ---------------------- |
| `--udp` | `-U`  | Use UDP instead of TCP |

Connects to the target port, reads the initial server response, and displays it. Useful for quick service fingerprinting without a full port scanner.