---
title: UInt128
framework: swift
role: symbol
role_heading: Structure
path: swift/uint128
---

# UInt128

A 128-bit unsigned integer value type.

## Declaration

```swift
@frozen struct UInt128
```

## Topics

### Operators

- [!=(_:_:)](swift/uint128/!=(_:_:).md)

### Initializers

- [init(bitPattern:)](swift/uint128/init(bitpattern:).md)

### Default Implementations

- [AdditiveArithmetic Implementations](swift/uint128/additivearithmetic-implementations.md)
- [AtomicRepresentable Implementations](swift/uint128/atomicrepresentable-implementations.md)
- [BinaryInteger Implementations](swift/uint128/binaryinteger-implementations.md)
- [Comparable Implementations](swift/uint128/comparable-implementations.md)
- [CustomReflectable Implementations](swift/uint128/customreflectable-implementations.md)
- [Decodable Implementations](swift/uint128/decodable-implementations.md)
- [Encodable Implementations](swift/uint128/encodable-implementations.md)
- [Equatable Implementations](swift/uint128/equatable-implementations.md)
- [ExpressibleByIntegerLiteral Implementations](swift/uint128/expressiblebyintegerliteral-implementations.md)
- [FixedWidthInteger Implementations](swift/uint128/fixedwidthinteger-implementations.md)
- [Hashable Implementations](swift/uint128/hashable-implementations.md)
- [Numeric Implementations](swift/uint128/numeric-implementations.md)
- [Strideable Implementations](swift/uint128/strideable-implementations.md)
- [UnsignedInteger Implementations](swift/uint128/unsignedinteger-implementations.md)

## Relationships

### Conforms To

- [AdditiveArithmetic](swift/additivearithmetic.md)
- [AtomicRepresentable](synchronization/atomicrepresentable.md)
- [BinaryInteger](swift/binaryinteger.md)
- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Comparable](swift/comparable.md)
- [Copyable](swift/copyable.md)
- [CustomReflectable](swift/customreflectable.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Decodable](swift/decodable.md)
- [Encodable](swift/encodable.md)
- [Equatable](swift/equatable.md)
- [Escapable](swift/escapable.md)
- [ExpressibleByIntegerLiteral](swift/expressiblebyintegerliteral.md)
- [FixedWidthInteger](swift/fixedwidthinteger.md)
- [Hashable](swift/hashable.md)
- [LosslessStringConvertible](swift/losslessstringconvertible.md)
- [Numeric](swift/numeric.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [Strideable](swift/strideable.md)
- [UnsignedInteger](swift/unsignedinteger.md)

## See Also

### Unsigned Integers

- [UInt](swift/uint.md)
- [UInt8](swift/uint8.md)
- [UInt16](swift/uint16.md)
- [UInt32](swift/uint32.md)
- [UInt64](swift/uint64.md)