unbound-host(1) unbound 1.19.3 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), no-
data (no such data) or positive data response validated cor-
rectly 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wrong, outdated, tampered with, or broken.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 de-
fault configured root anchor at the default location, /usr/lo-
cal/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 re-
solv.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 er-
ror. 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 14, 2024 unbound-host(1)
