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Scanning Networks · Module 03

fping

Ping many hosts at once to quickly see which are up.

ModuleModule 03PhaseScanning NetworksTypeDefensive / AnalysisPlatformKali Linux

Safe to try on your own machine. Spin up your Kali Linux lab and practice away — on any system you own or have permission to test. That’s exactly how the pros learn.

Definition

fping is a command-line diagnostic tool that sends ICMP Echo Requests to many hosts at the same time.

Primary purpose

Check host reachability and identify responsive systems across IP addresses or ranges.

Cybersecurity use

Network discovery, host availability checks, and authorized reconnaissance.

Key features

Multiple host checks

Tests reachability of many hosts at once.

Network range scanning

Checks IP addresses across a subnet.

ICMP probes

Uses ICMP Echo Requests to test responsiveness.

Quiet mode

Can show only responsive hosts or suppress output.

Batch processing

Accepts hostnames or IPs from input files.

Important commands

fping 192.168.1.10

Check whether one host responds to ICMP.

fping -a -g 192.168.1.0/24

Show responsive hosts in a range.

fping -u -g 192.168.1.0/24

Show unresponsive hosts in a range.

fping -c 4 192.168.1.10

Send four probes to the host.

fping -f hosts.txt

Read hostnames / IPs from a file.

Practical examples

01Check a host
command
fping 192.168.1.10

Purpose Checks whether the host responds to ICMP.

02Discover responsive hosts
command
fping -a -g 192.168.1.0/24

Purpose Generates addresses in the subnet and shows which respond.

03Send four probes
command
fping -c 4 192.168.1.10

Purpose Sends four probes and reports response statistics.

04Read hosts from a file
command
fping -f hosts.txt

Purpose Checks every host listed in hosts.txt.

Important points

  • ICMP: Uses ICMP Echo Requests and Replies to test responsiveness.
  • No response: Does not always mean offline — firewalls may block ICMP.
  • fping vs ping: ping tests one target; fping tests many efficiently.
  • Not a port scanner: fping does not identify open TCP/UDP ports.
  • Authorization: Test only networks and systems you are permitted to assess.

Common use cases

Host discovery

Identify responsive devices on an authorized network.

Availability testing

Perform basic connectivity checks.

Subnet auditing

Identify responsive IPs across a range.

Security reconnaissance

Support the host-discovery phase of an assessment.

Learn it in context

This tool is taught in Module 03

Read the full written notes, with diagrams, defense and detection.

Open Module 03
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