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)