Namespace node.dns

Use require('dns') to access this module. Here is an example which resolves 'www.google.com' then reverse resolves the IP addresses which are returned.

    var dns = require('dns');

    dns.resolve4('www.google.com', function (err, addresses) {
      if (err) throw err;

      console.log('addresses: ' + JSON.stringify(addresses));

      addresses.forEach(function (a) {
        dns.reverse(a, function (err, domains) {
          if (err) {
            console.log('reverse for ' + a + ' failed: ' +
              err.message);
          } else {
            console.log('reverse for ' + a + ': ' +
              JSON.stringify(domains));
          }
        });
      });
    });

Defined in: node.dns.js

Field Summary
Field Attributes	Field Name and Description
static	node.dns.BADNAME
static	node.dns.BADRESP
static	node.dns.CONNREFUSED
static	node.dns.DESTRUCTION
static	node.dns.EREFUSED
static	node.dns.FORMERR
static	node.dns.NODATA
static	node.dns.NOMEM
static	node.dns.NOTFOUND
static	node.dns.NOTIMP
static	node.dns.SERVFAIL
static	node.dns.TIMEOUT

Method Summary

Method Attributes	Method Name and Description
static	node.dns.getHostByAddr(address, family, callback)
static	node.dns.getHostByName(domain, family, callback)
static	node.dns.lookup(domain, family, callback) Resolves a domain (e.g.
static	node.dns.resolve(domain, type_, callback_) Resolves a domain (e.g.
static	node.dns.resolve4(domain, callback) The same as `dns.resolve()`, but only for IPv4 queries (`A` records).
static	node.dns.resolve6(domain, callback) The same as `dns.resolve4()` except for IPv6 queries (an `AAAA` query).
static	node.dns.resolveCname(domain, callback)
static	node.dns.resolveMx(domain, callback) The same as `dns.resolve()`, but only for mail exchange queries (`MX` records).
static	node.dns.resolveNs(domain, callback)
static	node.dns.resolveSrv(domain, callback) The same as `dns.resolve()`, but only for service records (`SRV` records).
static	node.dns.resolveTxt(domain, callback) The same as `dns.resolve()`, but only for text queries (`TXT` records).
static	node.dns.reverse(domain, callback) Reverse resolves an ip address to an array of domain names.

Field Detail

static node.dns.BADNAME

static node.dns.BADRESP

static node.dns.CONNREFUSED

static node.dns.DESTRUCTION

static node.dns.EREFUSED

static node.dns.FORMERR

static node.dns.NODATA

static node.dns.NOMEM

static node.dns.NOTFOUND

static node.dns.NOTIMP

static node.dns.SERVFAIL

static node.dns.TIMEOUT

Method Detail

static node.dns.getHostByAddr(address, family, callback)

Parameters:

{string} address

{string} family

{function(Error?|...[*]):undefined=} callback
static node.dns.getHostByName(domain, family, callback)

Parameters:

{string} domain

{string} family

{function(Error?|...[*]):undefined=} callback
static node.dns.lookup(domain, family, callback)

Resolves a domain (e.g. 'google.com') into the first found A (IPv4) or AAAA (IPv6) record. The callback has arguments (err, address, family). The address argument is a string representation of a IP v4 or v6 address. The family argument is either the integer 4 or 6 and denotes the family of address (not necessarily the value initially passed to lookup).

Parameters:

{string} domain

{string} family

{function(Error?|...[*]):undefined=} callback
static node.dns.resolve(domain, type_, callback_)

Resolves a domain (e.g. 'google.com') into an array of the record types specified by rrtype. Valid rrtypes are A (IPV4 addresses), AAAA (IPV6 addresses), MX (mail exchange records), TXT (text records), SRV (SRV records), and PTR (used for reverse IP lookups). The callback has arguments (err, addresses). The type of each item in addresses is determined by the record type, and described in the documentation for the corresponding lookup methods below. On error, err would be an instanceof Error object, where err.errno is one of the error codes listed below and err.message is a string describing the error in English.

Parameters:

{string} domain

{string} type_

{string} callback_
static node.dns.resolve4(domain, callback)

The same as dns.resolve(), but only for IPv4 queries (A records). addresses is an array of IPv4 addresses (e.g. ['74.125.79.104', '74.125.79.105', '74.125.79.106']).

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.resolve6(domain, callback)

The same as dns.resolve4() except for IPv6 queries (an AAAA query).

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.resolveCname(domain, callback)

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.resolveMx(domain, callback)

The same as dns.resolve(), but only for mail exchange queries (MX records). addresses is an array of MX records, each with a priority and an exchange attribute (e.g. [{'priority': 10, 'exchange': 'mx.example.com'},...]).

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.resolveNs(domain, callback)

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.resolveSrv(domain, callback)

The same as dns.resolve(), but only for service records (SRV records). addresses is an array of the SRV records available for domain. Properties of SRV records are priority, weight, port, and name (e.g., [{'priority': 10, {'weight': 5, 'port': 21223, 'name': 'service.example.com'}, ...]).

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.resolveTxt(domain, callback)

The same as dns.resolve(), but only for text queries (TXT records). addresses is an array of the text records available for domain (e.g., ['v=spf1 ip4:0.0.0.0 ~all']).

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback
static node.dns.reverse(domain, callback)

Reverse resolves an ip address to an array of domain names. The callback has arguments (err, domains). If there an an error, err will be non-null and an instanceof the Error object. Each DNS query can return an error code. - dns.TEMPFAIL: timeout, SERVFAIL or similar. - dns.PROTOCOL: got garbled reply. - dns.NXDOMAIN: domain does not exists. - dns.NODATA: domain exists but no data of reqd type. - dns.NOMEM: out of memory while processing. - dns.BADQUERY: the query is malformed.

Parameters:

{string} domain

{function(Error?|...[*]):undefined=} callback

Classes

Namespace node.dns

Method Summary

Field Detail

Method Detail