// Convert IPv4 to long
const long = net_utils.ip_to_long('11.22.33.44') // 185999660

// Convert long to IPv4
const ip = net_utils.long_to_ip(185999660) // 11.22.33.44

// Convert decimal to hex
const hex = net_utils.dec_to_hex(20111104) // 132df00

// Convert hex to decimal
const dec = net_utils.hex_to_dec('132df00') // 20111104

// Is IPv4 address on a local network?
net_utils.is_local_ipv4('127.0.0.200') // true (localhost)
net_utils.is_local_ipv4('169.254.0.0') // true (link local)
net_utils.is_local_ipv4('226.0.0.1') // false

// Is IPv4 address in RFC 1918 reserved private address space?
net_utils.is_private_ipv4('10.0.0.0') // true
net_utils.is_private_ipv4('192.168.0.0') // true
net_utils.is_private_ipv4('172.16.0.0') // true

// Is IPv6 addr on local network?
net_utils.is_local_ipv6('::1') // true (localhost)
net_utils.is_local_ipv6('fe80::') // true (link local)
net_utils.is_local_ipv6('fc00::') // true (unique local)
net_utils.is_local_ipv6('fd00::') // true (unique local)

// searches for 'ip' as a hash key in the list object or array
// ip can be a host, an IP, or an IPv4 or IPv6 range
net_utils.ip_in_list(object, ip)
net_utils.ip_in_list(array, ip)
net_utils.ip_in_list(tls.no_tls_hosts, '127.0.0.5')

try {
  const ips = await net_utils.get_ips_by_host(domain)
  for (const ip of ips) {
    // do something with the IPs
  }
} catch (err) {
  // handle any errors
}

try {
  const mxList = await net_utils.get_mx(domain)
  for (const mx of mxList) {
    // do something with each mx
  }
} catch (err) {
  // handle any errors
}

{
  exchange: '', // required: a FQDN or IP address
  path: '', // the file path to a socket
  priority: 0, // integer, a MX priority.
  port: 25, // integer: an alternate port
  bind: '', // an outbound IP address to bind to
  bind_helo: '', // an outbound helo hostname
  using_lmtp: false, // boolean, specify LMTP delivery
  auth_user: '', // an AUTH username (required if AUTH is desired)
  auth_pass: '', // an AUTH password (required if AUTH is desired)
  auth_type: '', // an AUTH type that should be used with the MX.
  from_dns: '', // the DNS name from which the MX was queried
}

const nu = require('haraka-net-utils')
const myMx = new nu.HarakaMx(parameter)