How Safari Pretended to Be Mozilla Before It Was Released - MacRumors
Skip to Content

How Safari Pretended to Be Mozilla Before It Was Released

by

NewImageFormer Apple employee Don Melton is sharing a unique look behind the scenes of the Safari development team. Melton was the team leader on both the Safari and WebKit products that are now used by millions of users on both iOS, the Mac, and Windows.

Previously, Melton explained how the Safari name came about, but today he shares the tale of Safari's User Agent string and the strategies his team used to keep the project under wraps.

Twitter and Facebook didn’t exist then. Nobody at Apple was stupid enough to blog about work, so what was I worried about?

Server logs. They scared the hell out of me.

When a Web browser fetches a page from a Web server, the browser identifies itself to that server with a user agent string — basically its name, version, platform, etc. The browser also gives the server an IP address so the server knows where to return the page. This exchange not only makes the Web work, it also allows the server to tell who is using what browser and where they’re using it.

You can see where this is going, right? But wait, there’s more…

Back around 1990, some forward-thinking IT person secured for Apple an entire Class A network of IP addresses. That’s right, Apple has 16,777,216 static IP addresses. And because all of these addresses belong together — in what’s now called a “/8 block” — every one of them starts with the same number. In Apple’s case, the number is 17.

IP address 17.149.160.49? That’s Apple. 17.1.2.3? Yes, Apple. 17.18.19.20? Also, Apple. 17.253.254.255? Apple, dammit!

I was so screwed.

Melton's blog has the rest of the details about how his team kept things quiet before the big reveal.

Top Rated Comments

173 months ago
So, he hid Safari as being Mozilla, by changing the user agent string. MAN THIS IS ONE HELL OF A FASCINATING REVEAL

Also, Safari is the best browser out there now, but I am going to go out on a limb and say that there was nobody in the industry that cared when it was released except the Apple fans
Score: 20 Votes (Like | Disagree)
tobefirst ⚽️ Avatar
173 months ago
I like how the MR article mentions "Mozilla" nowhere except for the title. Reading the MR article itself doesn't tell you at all that they masked Safari as any Mozilla product. That's some quality writing right there!
Score: 11 Votes (Like | Disagree)
TehFalcon Avatar
173 months ago
THIS is why I love Apple. Just a bunch of geeks running a company. Now I Cant say Mr. Cook is much of a geek. But the ones who do everything to run apple, are.
Score: 11 Votes (Like | Disagree)
Macrolido Avatar
173 months ago
It´s interesting the fact that he says Scott Forstall was a great boss.
Score: 10 Votes (Like | Disagree)
173 months ago
Safari was a pain in the neck in it's early versions before becoming the gold standard in Mac web browsers. I've been a Safari advocate for years now.

Version 6, however, is infuriating. The reload-on-back behavior is unacceptable. I use the trackpad or Magic Mouse to swipe back a page, and the animation looks great, but the fact that it forces a reload of the page, delays me while it reloads, and often puts me at the top of the page is a real detractor. I'm trying to deal with it until something changes, but I may need to hop ship to an inferior browser if this basic functionality is not addressed.
Score: 9 Votes (Like | Disagree)
173 months ago
It has been common knowledge that apple owns the 17 class A block since forever. This is not a new revelation for those of us who have been apple followers for 20+ years.

You need to learn what "common knowledge" means :rolleyes:
Score: 8 Votes (Like | Disagree)

Popular Stories

iOS 26

iOS 26.4 Adds Two New Features to CarPlay

Tuesday March 24, 2026 1:55 pm PDT by
iOS 26.4 was released today, and it includes a couple of new features for CarPlay: an Ambient Music widget and support for voice-based chatbot apps. To update your iPhone 11 or newer to iOS 26.4, open the Settings app and tap on General → Software Update. CarPlay will automatically offer the new features so long as the iPhone connected to your vehicle is running iOS 26.4 or later....
AirPods Pro Firmware Feature

Apple Releases New Firmware for AirPods Pro 3, AirPods Pro 2 and AirPods 4

Tuesday March 24, 2026 12:31 pm PDT by
Apple today released new firmware for the AirPods Pro 2, AirPods Pro 3, and the AirPods 4. The firmware has a version number of 8B39, up from 8B34 on the AirPods Pro 3, 8B28 on the AirPods Pro 2, and 8B21 on the AirPods 4. There is no word on what's included in the firmware, but Apple has a support document with limited notes. Most updates are limited to bug fixes and performance...
apple tv 4k new orange

tvOS 26.4 Adds These New Features to Your Apple TV

Wednesday March 25, 2026 3:33 pm PDT by
Apple this week released tvOS 26.4, and the software update includes a handful of new features and changes for the Apple TV. tvOS 26.4 is compatible with all Apple TV 4K and Apple TV HD models released since 2015. To update your Apple TV, open the Settings app on the device, navigate to System → Software Updates, and select Update Software. Below, we have recapped what is new in tvOS...