LookupOneOptions

When true, the callback returns all resolved addresses in an array. Otherwise, returns a single address.

The record family. Must be 4, 6, or 0. For backward compatibility reasons, 'IPv4' and 'IPv6' are interpreted as 4 and 6 respectively. The value 0 indicates that either an IPv4 or IPv6 address is returned. If the value 0 is used with { all: true } (see below), both IPv4 and IPv6 addresses are returned.

One or more supported getaddrinfo flags. Multiple flags may be passed by bitwise ORing their values.

When verbatim, the resolved addresses are return unsorted. When ipv4first, the resolved addresses are sorted by placing IPv4 addresses before IPv6 addresses. When ipv6first, the resolved addresses are sorted by placing IPv6 addresses before IPv4 addresses. Default value is configurable using {@link setDefaultResultOrder} or --dns-result-order.

When true, the callback receives IPv4 and IPv6 addresses in the order the DNS resolver returned them. When false, IPv4 addresses are placed before IPv6 addresses. This option will be deprecated in favor of order. When both are specified, order has higher precedence. New code should only use order. Default value is configurable using {@link setDefaultResultOrder}