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IP Addressing and Subnetting Certification

Master IP addresses from the bits up: binary, IPv4 anatomy, subnet masks, CIDR, subnetting drills, private ranges, network planning with VLSM, and a first look at IPv6. Practice everything in the terminal.

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46 lessonsBeginner → IntermediateFree forever

Inside this course

Each chapter is a hands-on milestone toward the final certificate. Browse the full syllabus to see every lesson.

01
Bits and Binary4 lessons
02
IPv4 Anatomy5 lessons
03
The Subnet Mask5 lessons
04
CIDR Notation4 lessons
+ 6 more chaptersVIEW THE FULL SYLLABUS

How it works

Three steps from your first line of code to a certificate you can show off.

  1. 01

    Pick a course

    Choose any course and start with the first lesson - no card, no signup wall.

  2. 02

    Code through the section

    Each section is a series of hands-on lessons and challenges where you write real code that runs in your browser.

  3. 03

    Earn & share your certificate

    Finish the section to unlock a verifiable certificate with a unique ID. Add it to LinkedIn, your CV, or your portfolio in one click.

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Frequently asked questions

How to obtain a Coddy certification?
Pick any journey on Coddy and complete a section - that is, finish every lesson and challenge inside it. As soon as you do, your certificate is generated automatically and added to your account.
Are Coddy certifications really free?
Yes - every certificate on Coddy is 100% free to earn, view, download, and share. There is no hidden paywall or subscription required to receive your certificate.
Why should you get a Coddy certification?
Stand out to employers by showcasing your hands-on coding skills. Unlike video-based certificates, a Coddy certificate proves you actually wrote and tested working code - which is what hiring managers care about. It validates your expertise, attracts recruiters, and can boost your earning potential.
How can someone verify my certificate?
Every certificate has a unique ID and a public URL. Anyone - including recruiters and employers - can paste the ID into the verification tool on this page, or open the URL directly, to confirm the certificate is genuine and see the details.
Can it be showcased on LinkedIn or an other platform?
Of course, it's easy! You are provided with a URL link, PDF format and a certification ID, you can share any of those to showcase your active certification.
How long does it take to earn one certificate?
It depends on the section and your pace. Most sections take a few hours of focused practice spread over a few days. Coddy is built around short, daily sessions, so you can fit it around school or work.
Can I earn multiple certificates?
Absolutely. Each journey is split into multiple sections, and each section issues its own certificate. You can also earn certificates across different languages and topics - many learners stack several to round out their profile.
I lost my certificate ID - what do I do?
Just sign in to your Coddy account and open this page - every certificate you've earned is listed under "My certifications" with a direct link and download button.
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