diff --git a/types/google-ddns/google-ddns-tests.ts b/types/google-ddns/google-ddns-tests.ts
new file mode 100644
index 0000000000..f62121be21
--- /dev/null
+++ b/types/google-ddns/google-ddns-tests.ts
@@ -0,0 +1,19 @@
+import { DynamicDNS, Service } from 'google-ddns';
+
+const ddns = new DynamicDNS({
+    hostname: 'subdomain.example.com',
+    username: 'foo',
+    password: 'bar',
+});
+
+ddns.sync(); // $ExpectType Promise<true | SuccessResponse>
+ddns.getCurrentIP(); // $ExpectType Promise<string>
+ddns.getPublicIP(); // $ExpectType Promise<string>
+
+const service = new Service({
+    hostname: 'subdomain.example.com',
+    username: 'foo',
+    password: 'bar',
+});
+
+service.start();
diff --git a/types/google-ddns/index.d.ts b/types/google-ddns/index.d.ts
new file mode 100644
index 0000000000..1c1fe22273
--- /dev/null
+++ b/types/google-ddns/index.d.ts
@@ -0,0 +1,192 @@
+// Type definitions for google-ddns 1.1
+// Project: https://github.com/DEDAjs/google-ddns#readme
+// Definitions by: Mick Dekkers <https://github.com/mickdekkers>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+/**
+ * The options for the DynamicDNS class
+ */
+export interface DynamicDNSOptions {
+    /**
+     * The dynamic DNS hostname.
+     */
+    hostname: string;
+    /**
+     * The dynamic DNS username.
+     */
+    username: string;
+    /**
+     * The dynamic DNS password.
+     */
+    password: string;
+    /**
+     * The URL used to check the current public IP of the device.
+     */
+    publicIpUrl?: string;
+    /**
+     * The URL of the Google Dynamic DNS API. Must include the text `%HOSTNAME%` and `%IPADDRESS%` as placeholders for the hostname and IP
+     * address.
+     */
+    updateIpUrl?: string;
+    /**
+     * The HTTP header User-Agent to send when updating the IP address.
+     * This is required by the Google Dynamic DNS API.
+     */
+    userAgent?: string;
+    /**
+     * Whether to fail or continue synchronizing if the current hostname
+     * was not resolved. This typically happens if the domain was created
+     * and has not yet been applied or propagated. See TTL (Time-to-Live)
+     * for more information. Even if this fails, the update can still be
+     * successful.
+     */
+    failOnUnresolvedHostName?: boolean;
+    /**
+     * The maximum number of times to attempt synchronization despite the
+     * hostname not being resolved. Applies if `failOnUnresolvedHostName`
+     * is `false`.
+     */
+    maxUnresolvedHostNameFail?: number;
+    /**
+     * Whether to cache the IP address of the DNS record or make a DNS
+     * request every time. This can usually be left enabled since this
+     * client is the only one responsible for updating the DNS record.
+     */
+    useHostIPAddressCache?: boolean;
+    /**
+     * If `useHostIPAddressCache` is `true`, this option is used to force a
+     * DNS request every once in a while. This is the number of seconds
+     * until the cache expires.
+     */
+    hostIPAddressCacheExpires?: number;
+    /**
+     * If debug mode is enabled, debug and status information will be
+     * written to the console.
+     */
+    debug?: boolean;
+}
+
+/**
+ * A response object for a successful response
+ */
+export interface SuccessResponse {
+    /**
+     * The response status
+     */
+    status: 'success';
+    /**
+     * The response code
+     */
+    response: 'good' | 'nochg';
+    /**
+     * A human-readable response message
+     */
+    message: string;
+    /**
+     * The IP address in the DNS record.
+     */
+    ip: string;
+}
+
+/**
+ * A response object for an error response
+ */
+export interface ErrorResponse {
+    /**
+     * The response status
+     */
+    status: 'error';
+    /**
+     * The response code (may include `good` or `nochg` in edge cases)
+     */
+    response:
+        | 'nohost'
+        | 'badauth'
+        | 'notfqdn'
+        | 'badagent'
+        | 'abuse'
+        | '911'
+        // Error status is possible for these in certain edge cases
+        | 'good'
+        | 'nochg';
+    /**
+     * A human-readable response message
+     */
+    message: string;
+    // This definition is here to make it possible to access the `ip`
+    // property in the union `SuccessResponse | ErrorResponse`
+    // See https://github.com/Microsoft/TypeScript/issues/12815
+    ip?: undefined;
+}
+
+/**
+ * A class to get the current public and DNS IPs and update the Google
+ * Dynamic DNS record.
+ */
+export class DynamicDNS {
+    constructor(options: DynamicDNSOptions);
+    /**
+     * Synchronizes the DNS IP address with the current public IP address.
+     * Compares the current public IP address against the DNS record for
+     * the domain, and updates the record if they differ.
+     * @param force Send an update request without checking whether
+     * the current DNS and public IPs differ.
+     * @returns `Promise<true>` if the public IP address and the IP address
+     * in the DNS record are the same and no sync was attempted. Otherwise
+     * returns a Promise of an object with response data. Error responses
+     * are rejected.
+     */
+    sync(force?: boolean): Promise<true | SuccessResponse>;
+    /**
+     * Gets the public IP address of the network hosting this application.
+     * @returns a Promise resolving with the IP or rejecting with an error object `{error: message}`
+     */
+    getPublicIP(): Promise<string>;
+    /**
+     * Gets the current IP address in the DNS record.
+     * @returns a Promise resolving with the IP or rejecting with an error object `{error: message}`
+     */
+    getCurrentIP(): Promise<string>;
+}
+
+/**
+ * The options for the Service class
+ */
+export interface ServiceOptions extends DynamicDNSOptions {
+    /**
+     * The number of seconds between updates.
+     */
+    checkInterval?: number;
+    /**
+     * The maximum number of consecutive errors before stopping the service
+     * if `exitOnMaxErrors` is `true`.
+     */
+    maxConsecutiveErrors?: number;
+    /**
+     * Whether to stop the service if the maximum number of consecutive
+     * errors is reached.
+     */
+    exitOnMaxErrors?: boolean;
+    /**
+     * The path of the log file to output to. Set to `false` to disable
+     * logging to file.
+     */
+    logPath?: string | false;
+    /**
+     * Whether to log output to the console.
+     */
+    logToConsole?: boolean;
+}
+
+/**
+ * A service class used to update a Google Dynamic DNS record on a time
+ * interval.
+ */
+export class Service {
+    constructor(options: ServiceOptions);
+    /**
+     * Start the service time interval.
+     */
+    start(): void;
+}
diff --git a/types/google-ddns/tsconfig.json b/types/google-ddns/tsconfig.json
new file mode 100644
index 0000000000..b0e572fb5b
--- /dev/null
+++ b/types/google-ddns/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "google-ddns-tests.ts"
+    ]
+}
diff --git a/types/google-ddns/tslint.json b/types/google-ddns/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/google-ddns/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }