IPv6 network scanner designed to be fast
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fi6s: Fast IPv6 scanner

fi6s is an IPv6 port scanner designed to be fast. This is achieved by sending and processing raw packets asynchronously. The design and goal is pretty similar to Masscan, though it is not as full-featured yet.


Building fi6s is fairly easy on any recent Linux system, e.g. on Ubuntu:

# apt install gcc make git libpcap-dev
$ git clone
$ cd fi6s
$ make BUILD_TYPE=release

The scanner executable will be ready at ./fi6s.

Note that fi6s is developed and tested solely on Linux. It should work on other UNIX-like platforms, but don't expect it to run on Windows.


Usage is pretty easy, fi6s will try to auto-detect the dirty technical details such as source, router MAC addresses and source IP.

# ./fi6s -p 80,8000-8100 2001:db8::/120

This example will:

  • scan the 2001:db8::/120 subnet (256 addresses in total)
  • scan TCP ports 80 and 8000 to 8100 (102 ports in total)
  • send as many packets per second as possible
  • output scan results to standard output in the "list" format

There are more different ways of specifying an address range to scan, if you aren't sure what's about to happen invoke fi6s with --print-hosts to print all IPs or --print-summary to get a quick overview about the scan.

For more advanced features please consult the output of fi6s --help.

Grabbing banners

Since fi6s has its own TCP stack, the OS' stack needs to disabled to avoid interference with banner grabbing (RST packets). This is easily done using ip6tables and a constant --source-port.

Banner grabbing is then enabled by passing --banners:

# ip6tables -A INPUT -p tcp -m tcp --dport 12345 -j DROP
# ./fi6s -p 22 --banners --source-port 12345 2001:db8::xx


Dropping packets before they reach the OS stack is not required for UDP scans, but is still a good idea to avoid a flood of ICMPv6 unreachable responses.

Other than that you only need an additional --udp:

# ip6tables -A INPUT -p udp -m udp --dport 12345 -j DROP
# ./fi6s -p 53 --banners --udp --source-port 12345 2001:db8::xx

Note that unlike with TCP, you will only get useful (or any) results if you scan a port whose protocol is supported by fi6s. You can use fi6s --list-protocols to view a list.

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