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FIERCE(1) General Commands Manual FIERCE(1)

NAME

fierce - DNS scanner that helps locate non-contiguous IP space and hostnames against specified domains.

SYNOPSIS

fierce [-h] [--domain DOMAIN] [--connect] [--wide] [--traverse NUMBER] [--search SEARCH [SEARCH ...]] [--range RANGE] [--delay DELAY] [--subdomains SUBDOMAINS [SUBDOMAINS ...] | --subdomain-file SUBDOMAIN_FILE] [--dns-servers DNS_SERVERS [DNS_SERVERS ...] | --dns-file DNS_FILE] [--tcp]

DESCRIPTION

Fierce is a semi-lightweight scanner that helps locate non-contiguous IP space and hostnames against specified domains. It's really meant as a pre-cursor to nmap, OpenVAS, nikto, etc, since all of those require that you already know what IP space you are looking for. This does not perform exploitation and does not scan the whole internet indiscriminately. It is meant specifically to locate likely targets both inside and outside a corporate network. Because it uses DNS primarily you will often find mis-configured networks that leak internal address space. That's especially useful in targeted malware. Originally written by RSnake along with others at http://ha.ckers.org/. This is simply a conversion to Python 3 to simplify and modernize the codebase.

OPTIONS

-h, --help

show this help message and exit

--domain DOMAIN

domain name to test

--connect

attempt HTTP connection to non-RFC 1918 hosts

--wide

scan entire class c of discovered records

--traverse NUMBER

scan NUMBER IPs before and after discovered records. This respects Class C boundaries and won't enter adjacent subnets.

--search SEARCH [SEARCH ...]

filter on these domains when expanding lookup

--range RANGE

scan an internal IP range, use cidr notation

--delay DELAY

time to wait between lookups

--subdomains SUBDOMAINS [SUBDOMAINS ...]

use these subdomains

--subdomain-file SUBDOMAIN_FILE

use subdomains specified in this file (one per line)

--dns-servers DNS_SERVERS [DNS_SERVERS ...]

use these dns servers for reverse lookups

--dns-file DNS_FILE

use dns servers specified in this file for reverse lookups (one per line)

--tcp

use TCP instead of UDP

EXAMPLES

Something basic:

$ fierce --domain google.com --subdomains accounts admin ads


Scan 10 IP addresses before and after discovered domains to find
    coniguous blocks using the `--traverse` flag:




$ fierce --domain facebook.com --subdomains admin --traverse 10






Limit nearby IP traversal to certain domains with the `--search`
    flag:




$ fierce --domain facebook.com --subdomains admin --search fb.com fb.net






Attempt an `HTTP` connection on domains discovered with the
    `--connect` flag:




$ fierce --domain stackoverflow.com --subdomains mail --connect






Exchange speed for breadth with the `--wide` flag, which looks for
    nearby domains on all IPs of the
    [/24](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#IPv4_CIDR_blocks)
    of a discovered domain:




$ fierce --domain facebook.com --wide






Zone transfers are rare these days, but they give us the keys to
    the DNS castle.
    [zonetransfer.me](https://digi.ninja/projects/zonetransferme.php) is a very
    useful service for testing for and learning about zone transfers:




$ fierce --domain zonetransfer.me






To save the results to a file for later use we can simply redirect
    output:




$ fierce --domain zonetransfer.me > output.txt






Internal networks will often have large blocks of contiguous IP
    space assigned. We can scan those as well:




$ fierce --dns-servers 10.0.0.1 --range 10.0.0.0/24