Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
dnsfilter(1)		    General Commands Manual		  dnsfilter(1)

NAME
       dnsfilter  -  reverse-resolves  IP  addresses,  converting them to host
       names.

SYNOPSIS
       dnsfilter [ opts	]

DESCRIPTION
       dnsfilter reads a series	of lines from stdin, converts an IP address to
       a  host	name  at the beginning of each line, and prints	the results to
       stdout.

       If a line does not begin	with an	IP address, dnsfilter leaves the  line
       alone.	If an IP address does not have a host name listed in DNS, dns-
       filter leaves the line alone.  If an IP address has a host name	listed
       in  DNS,	 dnsfilter inserts an equals sign and the host name before the
       first space or tab in the line.	If a  DNS  lookup  fails  temporarily,
       dnsfilter inserts a colon and a dash-separated error message before the
       first space or tab in the line.

       While dnsfilter is looking up an	address	in DNS,	it reads ahead in  the
       input and looks for more	addresses to look up in	parallel.

OPTIONS
       opts is a series	of getopt-style	options:

       -c n   Do at most n DNS queries in parallel.  Default: 10.

       -l n   Read ahead at most n lines.  Default: 1000.

SEE ALSO
       dnsip(1),   dnsipq(1),	dnsname(1),   dnsmx(1),	 dnstxt(1),  dnsqr(1),
       dnsq(1),	dnstrace(1)

       http://cr.yp.to/djbdns.html

								  dnsfilter(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=dnsfilter&sektion=1&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help