simple command line tool to check or monitor your https certificate

After downloading the installer, follow the on-screen instructions to install Cisco Packet Tracer 7.3.1. You may need to activate the software using a valid license or activation code.

Cisco Packet Tracer is a network simulation tool that allows users to design, configure, and troubleshoot computer networks. It is widely used by students, educators, and professionals to learn and practice networking concepts. The latest version, Cisco Packet Tracer 7.3.1, offers advanced features and improvements.

CheckSSL has marked this as a pass result CheckSSL has marked this as a fail result

deployed on AWS Lambda

Install Locally

Great for checking lots of sites, scripting or use with private servers

Docker

docker run --rm szazeski/checkssl checkssl.org

Linux or Mac

wget https://github.com/szazeski/checkssl/releases/download/v0.5.0/checkssl_0.5.0_$(uname -s)_$(uname -m).tar.gz -O checkssl.tar.gz && tar -xf checkssl.tar.gz && chmod +x checkssl && sudo mv checkssl /usr/bin/

Mac via Mac Ports

sudo port install checkssl

Mac via Homebrew

brew install szazeski/tap/checkssl

Windows Powershell

Invoke-WebRequest https://github.com/szazeski/checkssl/releases/download/v0.5.0/checkssl_0.5.0_Windows_x86_64.tar.gz -outfile checkssl.tar.gz; tar -xzf checkssl.tar.gz; echo "if you want, move the file to a PATH directory like WINDOWS folder"

View github installation instructions for how to install on mac and windows

Download Releases for Windows, Mac, or Linux

View Source / Contribute New Features

Checkssl is an open source project that you can modify and use for your personal or commercial projects.

Goto checkssl on Github

Written in Go under a MIT License

Cisco Packet Tracer 7.3.1 Download !exclusive! May 2026

After downloading the installer, follow the on-screen instructions to install Cisco Packet Tracer 7.3.1. You may need to activate the software using a valid license or activation code.

Cisco Packet Tracer is a network simulation tool that allows users to design, configure, and troubleshoot computer networks. It is widely used by students, educators, and professionals to learn and practice networking concepts. The latest version, Cisco Packet Tracer 7.3.1, offers advanced features and improvements. cisco packet tracer 7.3.1 download

Other Tools to Check Out

Let's Encrypt is great way to generate free SSL certificates for your server

Qualsys SSL Lab produces detailed report of your SSL Certificate, ciphers and vulnerabilities.

Mozilla SSL Config produces ideal SSL config for various web servers.

BadSSL maintains testing servers with various issues, great for testing your monitoring setup

Illustrated TLS Connection every byte of a TLS connection explained and reproduced.

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