FPDNS(1)

NAME
fpdns - DNS server fingeprinting tool

SYNOPSIS
fpdns [ -d ] [ -f ] [ -F nchild ]
   [ -p port ] [ -Q srcaddr ] [ -r retry ]
   [ -s ] [ -S separator ] [ -t timeout ] [ -v ] [server(s)]

DESCRIPTION
fpdns is a program that remotely determines DNS server versions. It does this by sending a series of borderline DNS queries which are compared against a table of responses and server versions.

False positives or incorrect versions may be reported when trying to identify a set of servers residing behind a load-balancing apparatus where the servers are of different implementations, when a specific implementation behaves like a forwarder, behind a firewall without statefull inspection or without Application Intelligence.

OPTIONS

-d  Enable debugging. Off by default.

-D  Check all authoritative servers of the specified domain name.

-f  Force checking of CH TXT version. Off by default.

-F nchild
    Maximum number of forked child processes. Defaults to 10.

-p port
    Port to query remote nameserver on. Default is 53.

-Q srcaddr
    Set the source IP address to use.

-r retry
    Number of attempt to retry fingerprints. Defaults to 1.

-s  Short display form. Useful for surveys.

-S  Separator. Defaults to " ".

-t timeout
    Set the query timeout in seconds. Defaults to 5.

-T  Use TCP instead of UDP.

-v  Show version of fpdns.

server
    IP address or name to query. Alternatively may be '-' to read from a list of these from stdin

AUTHORS
fpdns was written by Roy Arends and Jakob Schlyter.

SEE ALSO
perl(1), Net::DNS(1)