unbound-host(1) 						  unbound 1.4.17						   unbound-host(1)

NAME

       unbound-host - unbound DNS lookup utility

SYNOPSIS

       unbound-host [-vdhr46] [-c class] [-t type] hostname [-y key] [-f keyfile] [-F namedkeyfile] [-C configfile]

DESCRIPTION

       Unbound-host  uses the unbound validating resolver to query for the hostname and display results. With the -v option it displays validation
       status: secure, insecure, bogus (security failure).

       By default it reads no configuration file whatsoever.  It attempts to reach the internet root servers.  With -C an unbound config file  and
       with -r resolv.conf can be read.

       The available options are:

       hostname
	      This name is resolved (looked up in the DNS).  If a IPv4 or IPv6 address is given, a reverse lookup is performed.

       -h     Show the version and commandline option help.

       -v     Enable  verbose output and it shows validation results, on every line.  Secure means that the NXDOMAIN (no such domain name), nodata
	      (no such data) or positive data response validated correctly with one of the keys.  Insecure means that  that  domain  name  has	no
	      security	set  up for it.  Bogus (security failure) means that the response failed one or more checks, it is likely wrong, outdated,
	      tampered with, or broken.

       -d     Enable debug output to stderr. One -d shows what the resolver and validator are doing and may tell you what is going on. More times,
	      -d -d, gives a lot of output, with every packet sent and received.

       -c class
	      Specify the class to lookup for, the default is IN the internet class.

       -t type
	      Specify  the  type  of  data  to lookup. The default looks for IPv4, IPv6 and mail handler data, or domain name pointers for reverse
	      queries.

       -y key Specify a public key to use as trust anchor. This is the base for a chain of trust that is built up from the  trust  anchor  to  the
	      response,  in order to validate the response message. Can be given as a DS or DNSKEY record.  For example -y "example.com DS 31560 5
	      1 1CFED84787E6E19CCF9372C1187325972FE546CD".

       -f keyfile
	      Reads keys from a file. Every line has a DS or DNSKEY record, in the format as for -y. The zone file format, the	same  as  dig  and
	      drill produce.

       -F namedkeyfile
	      Reads keys from a BIND-style named.conf file. Only the trusted-key {}; entries are read.

       -C configfile
	      Uses the specified unbound.conf to prime libunbound(3).

       -r     Read /etc/resolv.conf, and use the forward DNS servers from there (those could have been set by DHCP).  More info in resolv.conf(5).
	      Breaks validation if those servers do not support DNSSEC.

       -4     Use solely the IPv4 network for sending packets.

       -6     Use solely the IPv6 network for sending packets.

EXAMPLES

       Some examples of use. The keys shown below are fakes, thus a security failure is encountered.

       $ unbound-host www.example.com

       $ unbound-host -v -y "example.com DS 31560 5 1 1CFED84787E6E19CCF9372C1187325972FE546CD" www.example.com

       $ unbound-host -v -y "example.com DS 31560 5 1 1CFED84787E6E19CCF9372C1187325972FE546CD" 192.0.2.153

EXIT CODE

       The unbound-host program exits with status code 1 on error, 0 on no error. The data may not be available on exit code 0, exit code 1  means
       the lookup encountered a fatal error.

SEE ALSO

       unbound.conf(5), unbound(8).

NLnet Labs							   May 24, 2012 						   unbound-host(1)