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NAME

       mdig - DNS pipelined lookup utility

SYNOPSIS

       mdig {@server} [-f filename] [-h] [-v] [[-4] | [-6]] [-m] [-b address] [-p port#]
            [-c class] [-t type] [-i] [-x addr] [plusopt...]

       mdig {-h}

       mdig [@server] {global-opt...} {{local-opt...} {query}...}

DESCRIPTION

       mdig is a multiple/pipelined query version of dig: instead of waiting for a response after
       sending each query, it begins by sending all queries. Responses are displayed in the order
       in which they are received, not in the order the corresponding queries were sent.

       mdig options are a subset of the dig options, and are divided into "anywhere options"
       which can occur anywhere, "global options" which must occur before the query name (or they
       are ignored with a warning), and "local options" which apply to the next query on the
       command line.

       The {@server} option is a mandatory global option. It is the name or IP address of the
       name server to query. (Unlike dig, this value is not retrieved from /etc/resolv.conf.) It
       can be an IPv4 address in dotted-decimal notation, an IPv6 address in colon-delimited
       notation, or a hostname. When the supplied server argument is a hostname, mdig resolves
       that name before querying the name server.

       mdig provides a number of query options which affect the way in which lookups are made and
       the results displayed. Some of these set or reset flag bits in the query header, some
       determine which sections of the answer get printed, and others determine the timeout and
       retry strategies.

       Each query option is identified by a keyword preceded by a plus sign (+). Some keywords
       set or reset an option. These may be preceded by the string no to negate the meaning of
       that keyword. Other keywords assign values to options like the timeout interval. They have
       the form +keyword=value.

ANYWHERE OPTIONS

       The -f option makes mdig operate in batch mode by reading a list of lookup requests to
       process from the file filename. The file contains a number of queries, one per line. Each
       entry in the file should be organized in the same way they would be presented as queries
       to mdig using the command-line interface.

       The -h causes mdig to print the detailed help with the full list of options and exit.

       The -v causes mdig to print the version number and exit.

GLOBAL OPTIONS

       The -4 option forces mdig to only use IPv4 query transport.

       The -6 option forces mdig to only use IPv6 query transport.

       The -b option sets the source IP address of the query to address. This must be a valid
       address on one of the host's network interfaces or "0.0.0.0" or "::". An optional port may
       be specified by appending "#<port>"

       The -m option enables memory usage debugging.

       The -p option is used when a non-standard port number is to be queried.  port# is the port
       number that mdig will send its queries instead of the standard DNS port number 53. This
       option would be used to test a name server that has been configured to listen for queries
       on a non-standard port number.

       The global query options are:

       +[no]additional
           Display [do not display] the additional section of a reply. The default is to display
           it.

       +[no]all
           Set or clear all display flags.

       +[no]answer
           Display [do not display] the answer section of a reply. The default is to display it.

       +[no]authority
           Display [do not display] the authority section of a reply. The default is to display
           it.

       +[no]besteffort
           Attempt to display the contents of messages which are malformed. The default is to not
           display malformed answers.

       +[no]cl
           Display [do not display] the CLASS when printing the record.

       +[no]comments
           Toggle the display of comment lines in the output. The default is to print comments.

       +[no]continue
           Continue on errors (e.g. timeouts).

       +[no]crypto
           Toggle the display of cryptographic fields in DNSSEC records. The contents of these
           field are unnecessary to debug most DNSSEC validation failures and removing them makes
           it easier to see the common failures. The default is to display the fields. When
           omitted they are replaced by the string "[omitted]" or in the DNSKEY case the key id
           is displayed as the replacement, e.g. "[ key id = value ]".

       +dscp[=value]
           Set the DSCP code point to be used when sending the query. Valid DSCP code points are
           in the range [0..63]. By default no code point is explicitly set.

       +[no]multiline
           Print records like the SOA records in a verbose multi-line format with human-readable
           comments. The default is to print each record on a single line, to facilitate machine
           parsing of the mdig output.

       +[no]question
           Print [do not print] the question section of a query when an answer is returned. The
           default is to print the question section as a comment.

       +[no]rrcomments
           Toggle the display of per-record comments in the output (for example, human-readable
           key information about DNSKEY records). The default is not to print record comments
           unless multiline mode is active.

       +[no]short
           Provide a terse answer. The default is to print the answer in a verbose form.

       +split=W
           Split long hex- or base64-formatted fields in resource records into chunks of W
           characters (where W is rounded up to the nearest multiple of 4).  +nosplit or +split=0
           causes fields not to be split at all. The default is 56 characters, or 44 characters
           when multiline mode is active.

       +[no]tcp
           Use [do not use] TCP when querying name servers. The default behavior is to use UDP.

       +[no]ttlid
           Display [do not display] the TTL when printing the record.

       +[no]ttlunits
           Display [do not display] the TTL in friendly human-readable time units of "s", "m",
           "h", "d", and "w", representing seconds, minutes, hours, days and weeks. Implies
           +ttlid.

       +[no]vc
           Use [do not use] TCP when querying name servers. This alternate syntax to +[no]tcp is
           provided for backwards compatibility. The "vc" stands for "virtual circuit".

LOCAL OPTIONS

       The -c option sets the query class to class. It can be any valid query class which is
       supported in BIND 9. The default query class is "IN".

       The -t option sets the query type to type. It can be any valid query type which is
       supported in BIND 9. The default query type is "A", unless the -x option is supplied to
       indicate a reverse lookup with the "PTR" query type.

       The -i option sets the reverse domain for IPv6 addresses to IP6.INT.

       Reverse lookups — mapping addresses to names — are simplified by the -x option.  addr is
       an IPv4 address in dotted-decimal notation, or a colon-delimited IPv6 address.  mdig
       automatically performs a lookup for a query name like 11.12.13.10.in-addr.arpa and sets
       the query type and class to PTR and IN respectively. By default, IPv6 addresses are looked
       up using nibble format under the IP6.ARPA domain. To use the older RFC1886 method using
       the IP6.INT domain specify the -i option.

       The local query options are:

       +[no]aaflag
           A synonym for +[no]aaonly.

       +[no]aaonly
           Sets the "aa" flag in the query.

       +[no]adflag
           Set [do not set] the AD (authentic data) bit in the query. This requests the server to
           return whether all of the answer and authority sections have all been validated as
           secure according to the security policy of the server. AD=1 indicates that all records
           have been validated as secure and the answer is not from a OPT-OUT range. AD=0
           indicate that some part of the answer was insecure or not validated. This bit is set
           by default.

       +bufsize=B
           Set the UDP message buffer size advertised using EDNS0 to B bytes. The maximum and
           minimum sizes of this buffer are 65535 and 0 respectively. Values outside this range
           are rounded up or down appropriately. Values other than zero will cause a EDNS query
           to be sent.

       +[no]cdflag
           Set [do not set] the CD (checking disabled) bit in the query. This requests the server
           to not perform DNSSEC validation of responses.

       +[no]cookie[=####]
           Send a COOKIE EDNS option, with optional value. Replaying a COOKIE from a previous
           response will allow the server to identify a previous client. The default is
           +nocookie.

       +[no]dnssec
           Requests DNSSEC records be sent by setting the DNSSEC OK bit (DO) in the OPT record in
           the additional section of the query.

       +[no]edns[=#]
           Specify the EDNS version to query with. Valid values are 0 to 255. Setting the EDNS
           version will cause a EDNS query to be sent.  +noedns clears the remembered EDNS
           version. EDNS is set to 0 by default.

       +[no]ednsflags[=#]
           Set the must-be-zero EDNS flags bits (Z bits) to the specified value. Decimal, hex and
           octal encodings are accepted. Setting a named flag (e.g. DO) will silently be ignored.
           By default, no Z bits are set.

       +[no]ednsopt[=code[:value]]
           Specify EDNS option with code point code and optionally payload of value as a
           hexadecimal string.  +noednsopt clears the EDNS options to be sent.

       +[no]expire
           Send an EDNS Expire option.

       +[no]nsid
           Include an EDNS name server ID request when sending a query.

       +[no]recurse
           Toggle the setting of the RD (recursion desired) bit in the query. This bit is set by
           default, which means mdig normally sends recursive queries.

       +retry=T
           Sets the number of times to retry UDP queries to server to T instead of the default,
           2. Unlike +tries, this does not include the initial query.

       +[no]subnet=addr[/prefix-length]
           Send (don't send) an EDNS Client Subnet option with the specified IP address or
           network prefix.

           mdig +subnet=0.0.0.0/0, or simply mdig +subnet=0 for short, sends an EDNS
           client-subnet option with an empty address and a source prefix-length of zero, which
           signals a resolver that the client's address information must not be used when
           resolving this query.

       +timeout=T
           Sets the timeout for a query to T seconds. The default timeout is 5 seconds for UDP
           transport and 10 for TCP. An attempt to set T to less than 1 will result in a query
           timeout of 1 second being applied.

       +tries=T
           Sets the number of times to try UDP queries to server to T instead of the default, 3.
           If T is less than or equal to zero, the number of tries is silently rounded up to 1.

       +udptimeout=T
           Sets the timeout between UDP query retries.

       +[no]unknownformat
           Print all RDATA in unknown RR type presentation format (RFC 3597). The default is to
           print RDATA for known types in the type's presentation format.

       +[no]zflag
           Set [do not set] the last unassigned DNS header flag in a DNS query. This flag is off
           by default.

SEE ALSO

       dig(1), RFC1035.

AUTHOR

       Internet Systems Consortium, Inc.

COPYRIGHT

       Copyright © 2015-2018 Internet Systems Consortium, Inc. ("ISC")