diff --git a/lib/ipaddr.js.d.ts b/lib/ipaddr.js.d.ts
new file mode 100644
index 0000000..bdd0737
--- /dev/null
+++ b/lib/ipaddr.js.d.ts
@@ -0,0 +1,71 @@
+
+
+declare module "ipaddr.js" {
+
+    type IPv4Range = 'unspecified' | 'broadcast' | 'multicast' | 'linkLocal' | 'loopback' | 'carrierGradeNat' | 'private' | 'reserved';
+    type IPv6Range = 'unspecified' | 'linkLocal' | 'multicast' | 'loopback' | 'uniqueLocal' | 'ipv4Mapped' | 'rfc6145' | 'rfc6052' | '6to4' | 'teredo' | 'reserved';
+
+    interface RangeList<T> {
+        [name: string]: [T, number] | [T, number][];
+    }
+
+
+    // Common methods/properties for IPv4 and IPv6 classes.
+    class IP {
+
+        prefixLengthFromSubnetMask(): number | false;
+        toByteArray(): number[];
+        toNormalizedString(): string;
+        toString(): string;
+    }
+
+    namespace Address {
+
+        export function isValid(addr: string): boolean;
+        export function fromByteArray(bytes: number[]): IPv4 | IPv6;
+        export function parse(addr: string): IPv4 | IPv6;
+        export function parseCIDR(mask: string): [IPv4 | IPv6, number];
+        export function process(address: string): IPv4 | IPv6;
+        export function subnetMatch(addr: IPv4, rangeList: RangeList<IPv4>, defaultName?: string): boolean;
+        export function subnetMatch(addr: IPv6, rangeList: RangeList<IPv6>, defaultName?: string): boolean;
+
+        export class IPv4 extends IP {
+            static broadcastAddressFromCIDR(addr: string): IPv4;
+            static isIPv4(addr: string): boolean;
+            static isValidFourPartDecimal(addr: string): boolean;
+            static isValid(addr: string): boolean;
+            static networkAddressFromCIDR(addr: string): IPv4;
+            static parse(addr: string): IPv4;
+            static parseCIDR(addr: string): [IPv4, number];
+            static subnetMaskFromPrefixLength(prefix: number): IPv4;
+            constructor(octets: number[]);
+
+            kind(): 'ipv4';
+            match(addr: IPv4, bits: number): boolean;
+            match(mask: [IPv4, number]): boolean;
+            range(): IPv4Range;
+            subnetMatch(rangeList: RangeList<IPv4>, defaultName?: string): boolean;
+            toIPv4MappedAddress(): IPv6;
+        }
+
+        export class IPv6 extends IP {
+            static broadcastAddressFromCIDR(addr: string): IPv6;
+            static isIPv6(addr: string): boolean;
+            static isValid(addr: string): boolean;
+            static parse(addr: string): IPv6;
+            static parseCIDR(addr: string): [IPv6, number];
+            static subnetMaskFromPrefixLength(prefix: number): IPv6;
+            constructor(octets: number[]);
+
+            isIPv4MappedAddress(): boolean;
+            kind(): 'ipv6';
+            match(addr: IPv6, bits: number): boolean;
+            match(mask: [IPv6, number]): boolean;
+            range(): IPv6Range;
+            subnetMatch(rangeList: RangeList<IPv6>, defaultName?: string): boolean;
+            toIPv4Address(): IPv4;
+        }
+    }
+
+    export = Address;
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 02eb9b5..71435cc 100644
--- a/package.json
+++ b/package.json
@@ -19,5 +19,6 @@
   "repository": "git://github.com/whitequark/ipaddr.js",
   "main": "./lib/ipaddr.js",
   "engines": { "node": ">= 0.10" },
-  "license": "MIT"
+  "license": "MIT",
+  "types": "./lib/ipaddr.js.d.ts"
 }