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              wrong, outdated, tampered with, or broken.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).

NLnet Labs                                        Mar  7, 2024                                   unbound-host(1)