A tiny, well-tested Swift library for handling IP Addresses.


SwiftIPAddress is a library for parsing and presenting IP addresses using Apple's Swift programming language. Not only does it present an idiomatic API that would feel familiar to developers, it is blazing fast, outperforming the Operating System standard libraries, and it is also extremely well tested.

Design Goals

There goals that guide this package's development are as follows:

The main types must be implemented in pure Swift code.

This project is implemented in pure Swift both as an academic exercise, as well as a constraint. It would be very easy to wrap the inet_ntop and inet_pton methods, however that would have both limited the compiler's ability to inline code, as well as prevented interoperability with future targets available to Swift.

The main types must use no more memory than required to represent their values.

In an age where memory is the most constricting resource in cloud deployments, it was extremely important to me to use no more memory than absolutely necessary for the internal representations. IPv4Address is represented internally with 4 bytes, and IPv6Address uses 16-bytes. They are also both value types, avoiding the need for any memory management.

The library must be goddamn fast.

This library currently exceeds the performance of the Operating System libraries quite handily when called from Swift. This is owing to the pure Swift implementation, eliminating the need to convert to and from C-friendly data structures, as well as the possibility for more aggressive inlining. This library proves that Swift code can be very performant, even outperforming the native C functions.


SwiftIPAddress is installed using the Swift Package Manager. It is compatible with projects using Swift 3.0 and later. To use it in your project, simply add the following line to your package's dependencies:

dependencies: [
    .Package(url: "https://github.com/Andrew-Dunn/SwiftIPAddress.git",

It may then be used directly by importing the IPAddress package at the start of your sources files.

import IPAddress

let ip = IPv6Address("2b88:b6::14")



The IPv4Address type is an immutable data structure that represents an IPv4 address.


The IPv6Address type is an immutable data structure that represents an IPv6 address.


Copyright © Andrew Dunn, 2017

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.


  • Swift Tools 3.1.0
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Last updated: Wed Jun 29 2022 14:58:53 GMT-0500 (GMT-05:00)