diff --git a/Sources/MaxMindDBReader/Decoder.swift b/Sources/MaxMindDBReader/Decoder.swift
index 23bc2cc..43a9235 100644
--- a/Sources/MaxMindDBReader/Decoder.swift
+++ b/Sources/MaxMindDBReader/Decoder.swift
@@ -38,9 +38,17 @@ class Decoder {
     }
   }
 
-  func decode(_ data: Data) -> UInt16 {
-    var wellSizedData = unpack(data, toBytesLength: 2)
-    let value         = UnsafeRawPointer(&wellSizedData).load(as: UInt16.self)
+  func decode<T>(_ data: Data) -> T where T: FixedWidthInteger, T: UnsignedInteger {
+    var wellSizedData = unpack(data, toBytesLength: MemoryLayout<T>.size)
+    let value         = UnsafeRawPointer(&wellSizedData).load(as: T.self)
     return input == .big ? value.bigEndian : value.littleEndian
   }
+
+  func decode<T>(_ data: Data) -> T where T: FixedWidthInteger, T: SignedInteger {
+    var wellSizedData = unpack(data, toBytesLength: MemoryLayout<T>.size)
+    let value = UnsafeRawPointer(&wellSizedData).load(as: T.self)
+    return input == .big ? value.bigEndian : value.littleEndian
+  }
+
 }
+
diff --git a/Tests/MaxMindDBReaderTests/DecoderTest.swift b/Tests/MaxMindDBReaderTests/DecoderTest.swift
index 566f6d6..bb1e88a 100644
--- a/Tests/MaxMindDBReaderTests/DecoderTest.swift
+++ b/Tests/MaxMindDBReaderTests/DecoderTest.swift
@@ -4,7 +4,7 @@ import XCTest
 
 fileprivate typealias TestSpec<T> = (expected: T, input: Data)
 
-fileprivate let testSpecs: [TestSpec<UInt16>] = [
+fileprivate let testSpecs_uInt16: [TestSpec<UInt16>] = [
   (expected: 0, input: Data()),
   (expected: 0, input: Data(count: 1)),
   (expected: 0, input: Data(count: 2)),
@@ -17,16 +17,106 @@ fileprivate let testSpecs: [TestSpec<UInt16>] = [
   (expected: 14200, input: Data(count: 14) + Data([0b0011_0111, 0b0111_1000]))
 ]
 
+fileprivate let testSpecs_uInt32: [TestSpec<UInt32>] = [
+  (expected: 0, input: Data()),
+  (expected: 0, input: Data(count: 1)),
+  (expected: 0, input: Data(count: 2)),
+  (expected: 0, input: Data(count: 3)),
+  (expected: 0, input: Data(count: 4)),
+  (expected: 0, input: Data(count: 5)),
+  (expected: 4294967295, input: Data([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])),
+  (expected: 4294967295, input: Data(count: 1) + Data([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])),
+  (expected: 14200, input: Data([0b0011_0111, 0b0111_1000])),
+  (expected: 14200, input: Data(count: 14) + Data([0b0011_0111, 0b0111_1000])),
+  (expected: 16702650, input: Data([0xFE, 0xDC, 0xBA])),
+  (expected: 16702650, input: Data(count: 14) + Data([0xFE, 0xDC, 0xBA]))
+]
+
+fileprivate let testSpecs_int32: [TestSpec<Int32>] = [
+  (expected: 0, input: Data()),
+  (expected: 0, input: Data(count: 1)),
+  (expected: 0, input: Data(count: 2)),
+  (expected: 0, input: Data(count: 3)),
+  (expected: 0, input: Data(count: 4)),
+  (expected: 0, input: Data(count: 5)),
+  (expected: -2147483647, input: Data([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])),
+  (expected: -2147483647, input: Data(count: 1) + Data([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])),
+  (expected: 2147483647, input: Data([0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])),
+  (expected: 2147483647, input: Data(count: 1) + Data([0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])),
+  (expected: 14200, input: Data([0b0011_0111, 0b0111_1000])),
+  (expected: 14200, input: Data(count: 14) + Data([0b0011_0111, 0b0111_1000])),
+  (expected: -14200, input: Data([0b1011_0111, 0b0111_1000])),
+  (expected: -14200, input: Data([0b1000_0000]) + Data(count: 13) + Data([0b0011_0111, 0b0111_1000])),
+  (expected: 16702650, input: Data([0xFE, 0xDC, 0xBA])),
+  (expected: 16702650, input: Data(count: 14) + Data([0xFE, 0xDC, 0xBA]))
+]
+
+fileprivate let testSpecs_uInt64: [TestSpec<UInt64>] = [
+  (expected: 0, input: Data()),
+  (expected: 0, input: Data(count: 1)),
+  (expected: 0, input: Data(count: 2)),
+  (expected: 0, input: Data(count: 3)),
+  (expected: 0, input: Data(count: 4)),
+  (expected: 0, input: Data(count: 5)),
+  (expected: 255, input: Data([0b1111_1111])),
+  (expected: 255, input: Data(count: 1) + Data([0b1111_1111])),
+  (expected: 14200, input: Data([0b0011_0111, 0b0111_1000])),
+  (expected: 14200, input: Data(count: 14) + Data([0b0011_0111, 0b0111_1000])),
+  (expected: 16702650, input: Data([0xFE, 0xDC, 0xBA])),
+  (expected: 16702650, input: Data(count: 14) + Data([0xFE, 0xDC, 0xBA])),
+  (expected: 280223976814164, input: Data([0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54])),
+  (expected: 280223976814164, input: Data(count: 14) + Data([0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54]))
+]
+
 class DecoderTest: XCTestCase {
 
   private let bigEndianDecoder    = Decoder(inputEndianness: .big)
   private let littleEndianDecoder = Decoder(inputEndianness: .little)
 
-  func testDecode() {
-    for (expected, input) in testSpecs {
+  func testDecode_uInt16() {
+    for (expected, input) in testSpecs_uInt16 {
       assertDecodedValue(expected, bigEndianDecoder.decode, data: input)
     }
-    for (expected, input) in testSpecs {
+    for (expected, input) in testSpecs_uInt16 {
+      assertDecodedValue(
+        expected,
+        littleEndianDecoder.decode,
+        data: Data(input.reversed())
+      )
+    }
+  }
+
+  func testDecode_uInt32() {
+    for (expected, input) in testSpecs_uInt32 {
+      assertDecodedValue(expected, bigEndianDecoder.decode, data: input)
+    }
+    for (expected, input) in testSpecs_uInt32 {
+      assertDecodedValue(
+        expected,
+        littleEndianDecoder.decode,
+        data: Data(input.reversed())
+      )
+    }
+  }
+
+  func testDecode_uInt64() {
+    for (expected, input) in testSpecs_uInt64 {
+      assertDecodedValue(expected, bigEndianDecoder.decode, data: input)
+    }
+    for (expected, input) in testSpecs_uInt64 {
+      assertDecodedValue(
+        expected,
+        littleEndianDecoder.decode,
+        data: Data(input.reversed())
+      )
+    }
+  }
+
+  func testDecode_int32() {
+    for (expected, input) in testSpecs_int32 {
+      assertDecodedValue(expected, bigEndianDecoder.decode, data: input)
+    }
+    for (expected, input) in testSpecs_int32 {
       assertDecodedValue(
         expected,
         littleEndianDecoder.decode,