This is the command dnsfilter that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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, dnsfilter 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.
Use dnsfilter online using onworks.net services
