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How To Identify Malicious Domains And Sites Using API?

Website Categorization API classifies a site into a content category. It takes a URL as an input and assigns it into the relevant industry. There’s a lot of Categorizations API available on the internet but Klazify seems to be the most popular above all and should suit all your needs for identifying malicious domains and sites.

Klazify’s Website Categorization API uses a machine learning (ML) engine to scan a website’s content and meta tags. It extracts text to classify the site and assigns up to three categories aided by natural language processing (NLP).

Their offline database is perfect for customers who require a local option for domain categorization. Typical use cases include hardware/product integrations, custom applications or internal use at an Enterprise organization with high request volume.

How Klazify works

Klazify will navigate to the requested domain name or URL, collect its content,  and determine appropriate categorizes based on a classification taxonomy: IAB V2 Standard, which can be used for 1-1 personalization, marketing segmentation, online filtering and more. The end result is that the URL or domain can now be placed in a specific category.

State of the art accuracy

Their website categorization API is highly accurate, a simple lookup to a company’s URL will classify its industry within 385 possible topic categories.

Domain Processing

Klazify’s domain processing begins one of two ways:

  • New Domain Ingestion: Klazify examines the website, chasing new domains and re-indexing previously categorized domains.
  • External feeds: External data sources that are given to Klazify to process


Once a URL has been processed and passed the safety checks, it gets categorized. 

Domain Categorization

There are over a lot of possible topic categories, making the list comprehensive but a little broader compared to other categorization taxonomies. 

Klazify’s categorization is ideal for internet filtering and security applications, and best thing of all? They support all the domains available and almost all the languages of the world.

The Classification Taxonomy that Klazify uses is from the IAB, which was referenced before. IAB stands for “Interactive Advertising Bureau.” They’ve created a standard list of categories and subcategories for advertising purposes.

For example, if a publisher is putting together a campaign on Google Ads and only wants to show up on specific websites, Google utilizes the IAB classification to decide which category a certain domain belongs to. This means that if publishers are using Klazify to determine if websites URLs are relevant and pertinent for them to advertise on, the categorization that is given to them in Klazify is also used on advertising websites all over the internet.


For Advertisers, Klazify offers domain data categorized to the IAB taxonomy. Through Klazify’s API, customers can process large sets of data, allowing them to identify patterns between IPs and backlinking information or to categorize your data set. Advertisers often find this information useful in order to enhance customer demographics and better understand their behavior.

Once Klazify finishes categorizing a domain, that domain can then have multiple categories associated with it. While a single website might only be placed in 3 categories using the IAB standards.

The IAB has nearly 385+ possible topic categories to choose from. 

Network & Cybersecurity

Network and Cybersecurity companies around the globe take advantage of Klazify’s APIs and data feeds to bring industry-leading threat intel and domain categorizations. Typical uses for Klazify include using their Domains API in order to dig deeper into network traffic or using their domain categorization API in order to categorize user access logs. Klazify incorporates over 66 data feeds to augment the engine.

Why Is Klazify The Best Option For Categorizing a Website?

  • Powerful & scalable

Klazify can scale to millions of requests and keep being stable under heavy workloads.

  • Easy-to-integrate

Customer’s time is valuable which is why Klazify’s APIs are simple to use and easy to integrate.

  • Dedicated Support Manager

Their Customer Support Team is always there to answer any questions.

  • Simple documentation

Each endpoint is well documented with examples so a customer can quickly get started.

Key Features

Big Data

Using advanced machine learning, Klazify categorize billions of web pages, keeping the categorization database one of the most accurate in the industry.

Wide Range of Applications

Klazify’s domain categorization allows customers to easily provide services such as Internet filtering, subscriber analytics, advertising networks, and fraud prevention.

Data Firehose

Need access to the raw data stream of everything as it’s being categorized? Klazify provides a real-time data firehose via HTTP.

Advanced Algorithms

Klazify’s technology categorizes content found on URLs, as well as entire websites and IP addresses, perfect for security devices that may not have access to the full URL.

Developer-Friendly Responses

Every API response is returned as JSON, which can be easily read and implemented into your product.

Always Up to Date

Klazify’s web crawlers are constantly visiting and classifying new and existing websites, providing real-time results and keeping the database always up to date.

So what’s the difference between the other website categorization API and Klazify?

The difference between all the other tools and Klazify is that the latter is the closest thing to a real human being checking every nook and cranny of the domain you’re interested in. The bonus is, this tool can do this on hundreds of thousands of websites in a single second for less than $790.00/year.

Also published on Medium.

Published inAppsArtificial Intelligence (AI)
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