Future<List<InternetAddress>> lookup(
String host,
{InternetAddressType type: InternetAddressType.ANY}
)

Lookup a host, returning a Future of a list of InternetAddresss. If type is InternetAddressType.ANY, it will lookup both IP version 4 (IPv4) and IP version 6 (IPv6) addresses. If type is either InternetAddressType.IP_V4 or InternetAddressType.IP_V6 it will only lookup addresses of the specified type. The order of the list can, and most likely will, change over time.

Source

/**
 * Lookup a host, returning a Future of a list of
 * [InternetAddress]s. If [type] is [InternetAddressType.ANY], it
 * will lookup both IP version 4 (IPv4) and IP version 6 (IPv6)
 * addresses. If [type] is either [InternetAddressType.IP_V4] or
 * [InternetAddressType.IP_V6] it will only lookup addresses of the
 * specified type. The order of the list can, and most likely will,
 * change over time.
 */
external static Future<List<InternetAddress>> lookup(
    String host, {InternetAddressType type: InternetAddressType.ANY});