Updated: 2022/Sep/29

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unbound-host(1)                 unbound 1.16.3                 unbound-host(1)



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              wrong, outdated, tampered with, or broken.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,
              /etc/unbound/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                       Sep 21, 2022                  unbound-host(1)