| Name | Description | Type | Package | Framework |
| Reachability | Immutable data structure that holds the reachability status of subject nodes as seen from observer nodes. | Class | akka.cluster | Akka |
| Reachability$ | Class | akka.cluster | Akka | |
| Reachability .Reachable$ | Class | akka.cluster.Reachability | Akka | |
| Reachability .Record | Class | akka.cluster.Reachability | Akka | |
| Reachability .Record$ | Class | akka.cluster.Reachability | Akka | |
| Reachability .Terminated$ | Class | akka.cluster.Reachability | Akka | |
| Reachability .Unreachable$ | Class | akka.cluster.Reachability | Akka | |