vertx / io.vertx.rxjava.core.dns / DnsClient / reverseLookup

# reverseLookup

`open fun reverseLookup(ipaddress: String, handler: Handler<AsyncResult<String>>): DnsClient`

Try to do a reverse lookup of an IP address. This is basically the same as doing trying to resolve a PTR record but allows you to just pass in the IP address and not a valid ptr query string.

### Parameters

`ipaddress` - the IP address to resolve the PTR for

`handler` - the to notify with the . The handler will get notified with the resolved java.lang.String if a record was found. If none was found it will get notified with `null`. If an error accours it will get failed.

Return
a reference to this, so the API can be used fluently.