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diff --git a/Firebase/Utilities/Reachability/Private/GULReachabilityChecker.h b/Firebase/Utilities/Reachability/Private/GULReachabilityChecker.h
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+++ b/Firebase/Utilities/Reachability/Private/GULReachabilityChecker.h
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+#import <SystemConfiguration/SystemConfiguration.h>
+
+/// Reachability Status
+typedef enum {
+  kGULReachabilityUnknown,  ///< Have not yet checked or been notified whether host is reachable.
+  kGULReachabilityNotReachable,  ///< Host is not reachable.
+  kGULReachabilityViaWifi,       ///< Host is reachable via Wifi.
+  kGULReachabilityViaCellular,   ///< Host is reachable via cellular.
+} GULReachabilityStatus;
+
+const NSString *GULReachabilityStatusString(GULReachabilityStatus status);
+
+@class GULReachabilityChecker;
+
+/// Google Analytics iOS Reachability Checker.
+@protocol GULReachabilityDelegate
+@required
+/// Called when network status has changed.
+- (void)reachability:(GULReachabilityChecker *)reachability
+       statusChanged:(GULReachabilityStatus)status;
+@end
+
+/// Google Analytics iOS Network Status Checker.
+@interface GULReachabilityChecker : NSObject
+
+/// The last known reachability status, or GULReachabilityStatusUnknown if the
+/// checker is not active.
+@property(nonatomic, readonly) GULReachabilityStatus reachabilityStatus;
+/// The host to which reachability status is to be checked.
+@property(nonatomic, copy, readonly) NSString *host;
+/// The delegate to be notified of reachability status changes.
+@property(nonatomic, weak) id<GULReachabilityDelegate> reachabilityDelegate;
+/// `YES` if the reachability checker is active, `NO` otherwise.
+@property(nonatomic, readonly) BOOL isActive;
+
+/// Initialize the reachability checker. Note that you must call start to begin checking for and
+/// receiving notifications about network status changes.
+///
+/// @param reachabilityDelegate The delegate to be notified when reachability status to host
+/// changes.
+///
+/// @param host The name of the host.
+///
+- (instancetype)initWithReachabilityDelegate:(id<GULReachabilityDelegate>)reachabilityDelegate
+                                    withHost:(NSString *)host;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+/// Start checking for reachability to the specified host. This has no effect if the status
+/// checker is already checking for connectivity.
+///
+/// @return `YES` if initiating status checking was successful or the status checking has already
+/// been initiated, `NO` otherwise.
+- (BOOL)start;
+
+/// Stop checking for reachability to the specified host. This has no effect if the status
+/// checker is not checking for connectivity.
+- (void)stop;
+
+@end