---
name: "knocker"
section: "1"
platform: "linux"
package: "knocker"
version: "0.7.1-6"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/knocker"
---

# knocker(1)

An easy to use network security port scanner

## NAME

knocker - An easy to use network security port scanner

## SYNOPSIS

**knocker --host \<host\>** \[*OPTION*\]

## DESCRIPTION

**knocker** is a simple and easy to use TCP security port scanner written in C using pthreads which is able to analyze hosts and all of the different services started on them.

## OPTIONS

- **-H**, **--host**

  host name or numeric Internet address to scan

- **-P**, **--port**

  port number to scan (single port scan only)

- **-SP**, **--start-port**

  port number to begin the scan from

- **-EP**, **--end-port**

  port number to end the scan at

- **--last-host**

  uses the last scanned host as target

- **--last-scan**

  performs again the last port scan

- **-q**, **--quiet**

  disable console output and logs to file.

- **-lf**, **--logfile \<logfile\>**

  log the results to a specified file.

- **-nf**, **--no-fency**

  disable fency output

- **-nc**, **--no-colors**

  disable colored output

- **--configure**

  let the user configure knocker

- **-h**, **--help**

  display this help and exit

- **-v**, **--version**

  output version information and exit

## EXAMPLES

To run this program the standard way type:

knocker --host 192.168.0.1

If you want to specify a port range to scan:

knocker --host thehost  --start-port 1 --end-port 2600

or

knocker -H thehost  -SP 1 -EP 2600

To scan a single port:

knocker -H thehost --port 21

To run this program not using colors (if your terminal does not support colors):

knocker --host 192.168.0.1 --no-colors

To run this program run in background and have the results written in a log file:

knocker --host 192.168.0.1 --quiet &

## AVAILABILITY

The latest version of this program can be found at http://knocker.sourceforge.net

## BUGS

See the BUGS file in the knocker source package for a list of known bugs. Report bugs to \<g.gabriele79@genie.it\>

## AUTHOR

knocker is written by Gabriele Giorgetti \<g.gabriele79@genie.it\>

## COPYRIGHT

Copyright © 2001,2002 Gabriele Giorgetti\
 This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.