DnsHostNameResolver

Reverse DNS lookup, bounded by an explicit timeout because a missing PTR record makes the resolver wait out its own retries. Only the first label is kept - a machine name is not an FQDN.

public sealed class DnsHostNameResolver : IHostNameResolver

1. Methods

1.1. ResolveAsync(IP, TimeSpan, CancellationToken)

Resolve the name for address, or null when nothing answers. Never throws for an unresolvable address.

public Task<MachineName?> ResolveAsync(IP address, TimeSpan timeout, CancellationToken cancellationToken)

Table 1. Parameters
Name	Type	Description
address	IP	Address to reverse-resolve.
timeout	TimeSpan	How long to wait before giving up.
cancellationToken	CancellationToken	Cancels the lookup.

Returns: Task<MachineName?>