NAME

       unbound-host - unbound DNS lookup utility

SYNOPSIS

       unbound-host  [-C  configfile]  [-vdhr46D]  [-c class] [-t type] [-y key] [-f keyfile] [-F
       namedkeyfile] hostname

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              response failed one or more checks, it is likely wrong, outdated, tampered with, or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".

       -D     Enables  DNSSEC validation.  Reads the root anchor from the default configured root
              anchor at the default location, /usr/share/dns/root.key.

       -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).  Pass it as first  argument
              if you want to override some options from the config file with further arguments on
              the commandline.

       -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).