DNS query

Perform a DNS query for a domain. It supports custom name servers, and querying DNS records of certain class and type.

Usage

nsl(domain, server = NULL, type = 1L, class = 1L)

Arguments

domain

Domain to query.

server

Custom name server IP address, to use. Note that this must be an IP address currently. E.g. 8.8.8.8 is Google's DNS server.

type

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.

class

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.

Value

A list of two entries currently, additional entries might be added later:

• answer: a data frame of DNS records, with columns: name, class, type, ttl, data. 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 aa, tc, rd, ra, ad, cd. See the RFC (https://www.ietf.org/rfc/rfc1035.txt) for these. On Windows they are all set to NA currently.

Examples

nsl("r-project.org")
#> $answer
#>            name class type  ttl          data
#> 1 r-project.org     1    1 1800 137.208.57.37
#> 
#> $flags
#>    aa    tc    rd    ra    ad    cd 
#> FALSE FALSE  TRUE  TRUE FALSE FALSE 
#> 
nsl("google.com", type = 28L)
#> $answer
#>         name class type ttl                   data
#> 1 google.com     1   28 128 2607:f8b0:4004:c17::8a
#> 2 google.com     1   28 128 2607:f8b0:4004:c17::64
#> 3 google.com     1   28 128 2607:f8b0:4004:c17::66
#> 4 google.com     1   28 128 2607:f8b0:4004:c17::8b
#> 
#> $flags
#>    aa    tc    rd    ra    ad    cd 
#> FALSE FALSE  TRUE  TRUE FALSE FALSE 
#>