Perform a DNS query for a domain. It supports custom name servers, and querying DNS records of certain class and type.
Domain to query.
Custom name server IP address, to use. Note that this must be an IP address currently. E.g. 220.127.116.11 is Google's DNS server.
Record type to query, an integer scalar. 1L is an A record, 28L is an AAAA record, etc. See e.g. https://en.wikipedia.org/wiki/List_of_DNS_record_types for the record types.
Query class. This is usually 1L, i.e. "Internet". See e.g. https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-2 for all DNS classes.
A list of two entries currently, additional entries might be added later:
answer: a data frame of DNS records, with columns:
data is a list column and
contains the IP(6) address for A and AAAA records, but it contains
other data, e.g. host name for CNAME, for other records. If pingr
could not parse a record (it only parses the most common records
types: A, AAAA, NA, PTR, CNAME, TXT, MX, SOA), then the data of
the record is included as a raw vector.
flags: a named logical vector of flags
cd. See the RFC (https://www.ietf.org/rfc/rfc1035.txt) for
these. On Windows they are all set to NA currently.
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