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Crawler List : Web Crawler Bots and How To Leverage Them

Most marketers find their websites need frequent upgrades to stay current and boost their SEO results. Teams who manually send updates to search engines have difficulties because some websites have hundreds or thousands of pages. How can teams be confident that these updates affect their SEO rankings if the material is being updated frequently?

Crawler bots have a role in this. Your sitemap will be scraped by a web crawler bot, which will then index the material in search engines.

There are both good and harmful bots when it comes to the internet. Bad bots should be avoided as they use server resources, eat CDN traffic, and steal material. However, excellent bots, sometimes called web crawlers, should be treated carefully since they are essential to indexing your information by search engines like Google, Bing, and Yahoo.

This article will provide a thorough crawler list that includes all the web crawler bots you need to know. Let’s define web crawler bots and demonstrate how they work before continuing.

What Is a Web Crawler?

It is software that crawls and examines web pages automatically and methodically so that search engines may index the content. Web crawlers are frequently referred to as bots or spiders.

A web crawl from a web crawler bot is required for search engines to show visitors who launch a search for relevant, current web pages. Depending on the parameters for the crawler and your site, this procedure can occasionally be started manually or automatically.

Relevancy, backlinks, web hosting, and other elements all influence the SEO ranking of your sites. None of these things will matter if search engines aren’t crawling and indexing your site. Ensuring that your site enables the proper crawls to occur and removing any obstacles in their path is crucial.

There isn’t just one web crawler that works with all search engines. Since each search engine has its own set of strengths, developers and marketers may occasionally construct a “crawler list.” They may distinguish between various crawlers in their site log and accept or prohibit them from using this crawler list.

How Do Web Crawlers Operate?

Using a variety of algorithms to evaluate the worth of the content or the caliber of the connections in its index, the website crawler “crawls” around the internet to discover the pages of websites to visit. These guidelines govern how it crawls, including which sites to crawl, how frequently to re-crawl a page, how many pages on a site to index, and other factors. It downloads the robots.txt file from a new website, the “robots exclusion standard” protocol used to block unrestricted access by web crawler programs. Sitemaps (the URLs to crawl) and search criteria (which portions of the pages should be searched and which should be ignored) are listed in the file. With well-known URLs, crawls begin. These are well-established websites with various signals pointing web spiders in their direction. These indications might be:

  • Backlinks: The frequency with which a website links to it
  • Viewers: How many people visit the page each day?
  • Domain: a measure of a domain’s overall quality called a domain authority

Each link, internal and external, is tracked by the crawler and added to the next page. The procedure is continued until the crawler reaches a page with no more links or runs into problems like 404 and 403, at this point, the site’s contents are loaded into a database and the search engine’s index. This extensive database lists the words and phrases that may be found on every page and indicates their locations on other web pages. The search and query tool aids the end-user in locating the website containing the term or phrase they have input.

The crawler of a search engine performs a crucial task called indexing. Relevant search results are provided by algorithms that analyze the links and their importance in the index.

To choose and show you the indexed web pages when you search for a specific term or phrase, the search engine considers hundreds of different variables.

Examples of factors taken into account are:

  • Content of a high standard
  • Content that complies with user search
  • The total number of links referring to the content
  • The number of internet shares it has received

Major search engines have several web crawlers operating concurrently from various servers. The listing of web addresses from earlier crawls and the sitemaps given by website owners mark the start of the process. The links on the crawlers’ websites are utilized to find further pages. Now you know the benefits of using backlinks for website SEO administrators. If search engines discover backlinks to your website, they might infer that other websites support your content.

Different Types of Web Crawlers

There are three basic categories of crawlers to consider when assembling your crawler list.

These consist of:

1. In-House Crawlers

Crawlers created in-house by a company’s development staff to browse its website are known as in-house crawlers. They are typically employed for site optimization and audits.

2. Commercial Crawlers

Businesses may use specially designed crawlers, like Screaming Frog, to effectively assess their material.

3. Open-Source Crawlers

These crawlers created by a range of programmers and hackers worldwide are available for free usage.

Understanding the many sorts of crawlers available can help you choose which to use to further your company objectives.

Top 10 Web Crawlers You Should Include in Your Crawler List

Hundreds of web crawlers and bots are combing the Internet, but we’ve compiled a crawler list of 14 of the more well-known ones based on those we frequently encounter in our web server logs.

1. Googlebot

For a site to appear in Google’s search engine, a web crawler known as Googlebot must first visit the site. Even though Googlebot has two different versions—Googlebot Desktop and Googlebot Smartphone (Mobile)—the majority of industry professionals view Googlebot as a single crawler.

This is because the robots.txt files on each website follow the same specific product token, also known as a user agent token. The user agent for Googlebot is just “Googlebot.”

Additionally, web admins may utilize Google Search Console to improve their pages for search and learn how Googlebot crawls their website.

2. Bingbot

Another bot from the crawler list is Microsoft developed Bingbot in 2010 to scan and index URLs to ensure that Bing provides consumers with relevant, up-to-date search engine results.

Like Googlebot, developers or marketers can specify whether they want the agent identification “bingbot” to scan their site in the robots.txt file on their website.

They can also differentiate between desktop and mobile-first indexing crawlers because Bingbot changed to a new agent type.

This gives web admins more freedom to demonstrate how their site is found and highlighted in search results, together with Bing Webmaster Tools.

3. Apple Bot

To index and crawl websites for Apple’s Siri and Spotlight Suggestions, Apple hired the Apple Bot.

Apple Bot considers various variables when determining which material to highlight in Siri and Spotlight Suggestions.

These elements include user interaction, search phrase relevancy, link quantity and quality, location-based signals, and website design.

4. Baidu Spider

The crawler list also has a Chinese crawler for the popular Chinese search engine Baidu called the Baidu Spider.

Since Google is blocked in China, allowing the Baidu Spider to scan your website is crucial if you want to do business there.

The user agents Baidu Spider, Baidu Spider-image, Baidu Spider-video, and others can be used to determine whether the Baidu Spider is currently crawling your website.

It can make sense to ban the Baidu Spider in your robots.txt script if you don’t conduct business in China. Doing this will stop the Baidu Spider from scanning your website, eliminating any possibility of your pages showing up on Baidu’s search engine results pages (SERPs).

5. Yandex Bot

From the crawler list, Yandex Bot is a crawler created exclusively for a Russian search engine. One of the biggest and most well-known search engines in Russia is this one.

Through their robots.txt file, web admins may make the pages of their sites available to Yandex Bot.

Additionally, they might add a Yandex. Metrica tags particular pages, reindexs pages in the Yandex Webmaster, or publishes an IndexNow protocol, a special report that identifies newly added, updated, or deleted pages.

6. DuckDuckBot

The web crawler for DuckDuckGo, a browser extension that delivers seamless privacy protection, is called the DuckDuckBot.

Web admins may check if the DuckDuck Bot has crawled their site using the DuckDuckBot API. Recent IP addresses and user agents are added to the DuckDuckBot API database as it crawls.

This aids web admins in spotting any harmful bots or imposters attempting to link up with DuckDuck Bot.

7. Sogou Spider

Sogu Spider is the second Chinese crawler from the crawler list. According to reports, Sogou, a Chinese search engine, is the first to index 10 billion Chinese pages.

You should know this prominent search engine crawler if you conduct business in the Chinese market. The Sogou Spider adheres to the crawl delay and exclusion text rules the robot sets.

Like the Baidu Spider, you should disable this spider to avoid delayed site loading times if you don’t wish to conduct business in the Chinese market.

8. Exabot

Software firm Exalead was founded in 2000 and has its headquarters in Paris, France. For both consumer and business clients, the company offers search platforms.

Based on their CloudView product, their primary search engine uses Exabot as its crawler.

Exalead, like the majority of search engines, ranks websites based on both backlinks and page content. Exalead’s robot’s user agent is called Exabot. The results that users of search engines will view are compiled into a “main index” by the robot.

9. Swiftbot

Swiftype is a unique search engine for your website. It fuses “the best search technology, algorithms, content ingestion framework, clients, and analytics tools.”

Swiftype provides a helpful interface to categorize and index all of your pages for you if your website is complicated and has lots of pages.

The web crawler for Swiftype is called Swiftbot. Swiftbot, however, only crawls websites that their clients request, unlike other bots.

10. External Facebook Hit

The last one from the web crawler list is Facebook Crawler, also known as Facebook External Hit, which scans the HTML of an app or website shared on Facebook.

Due to this, every link submitted on the social network might provide a shareable preview. The crawler is responsible for the thumbnail image, title, and description appearing.

If the crawl is not carried out in seconds, Facebook will not display the material in the custom snippet created before sharing.

How Can the Web Crawler Aid SEO Professionals?

Enhancing the quantity and quality of website visitors is done through search engine optimization. This is accomplished by making a website or web page more visible to a web search engine.

The web crawler has significant SEO ramifications, as you have just discovered. A website’s content impacts how it is indexed by search engines and shown to end users. The higher the information is rated in search engine results, the better.

A few factors can improve a website’s placement in search results. Good content

  • Use popular keyphrases for your audience.
  • hosted on a quick website with simple navigation
  • is cited as a source of authority by other websites

Because so many searchers don’t surpass the first three results, ranking well is critical. Even fewer people will scroll past page one of the results. A website is almost invisible if it does not appear on the main page of search results. Web spiders will examine your website to see whether it merits a position on the first page.

8 Commercial Crawlers That SEO Experts Should Know

Now that your crawler list includes 10 popular bots let’s look at some typical commercial crawlers and SEO tools for experts.

i. Ahrefs Bot

The prominent SEO software provider Ahrefs, provides a 12 trillion link database compiled and indexed by the Ahrefs Bot, a web crawler.

The Ahrefs Bot is regarded as “the second most active crawler” behind Googlebot, visiting 6 billion web pages daily.

It follows both the allows/disallows directives in each site’s code and the robots.txt functionality, much like other bots do.

ii. Moz's Campaign Crawler Rogerbot

From the crawler list, the next crawler for Moz, the top SEO website, is called Rogerbot. This crawler collects material, particularly for site audits for the Moz Pro Campaign.

You may choose whether to prevent Rogerbot from scanning your website or allow it to do so because Rogerbot complies with all robots.txt file instructions.

Due to Rogerbot’s multifarious approach, web admins won’t be able to look for a static IP address to discover which pages it has crawled.

iii. Lumar (formerly Deep Crawl)

Lumar is a “centralized command center for ensuring the technical integrity of your site.“. Using this tool, you may start a crawl of your website to aid in site architectural planning.

The company Lumar claims to be the “fastest website crawler on the market” and can crawl up to 450 URLs per second.

iv. Semrush Bot

Semrush Bot is the Leading SEO software of the crawler list, it can gather and index site data for its users on its platform thanks to the Semrush Bot.

Semrush’s public backlink search engine, site audit tool, backlink audit tool, link building tool, and writing assistant all use the data.

It examines a list of web page URLs to crawl your website, keeping some of the links for subsequent visits.

v. Screaming Frog

SEO experts analyze their websites using the crawler Screaming Frog to find areas for improvement that would affect their search engine rankings.

Once a crawl has been started, you can look at the data in real-time and find any broken links or changes that need to be made to your page titles, metadata, robots, duplicate content, and more.

You must obtain a Screaming Frog license to set the crawl settings.

vi. CognitiveSEO

CognitiveSEO is another important SEO software of the crawler list that many professionals use.

The cognitiveSEO crawler enables users to perform comprehensive site audits that will inform their architecture and overarching SEO strategy.

All pages will be crawled by the bot, which will then offer “a fully customized set of data” that is specific to the user.

This data set will also have recommendations for the user on improving their site for other crawlers—both to impact rankings and block crawlers that are unnecessary.

vii. Majestic

Majestic’s main areas of interest include monitoring and locating backlinks on URLs.

The business enjoys having “one of the most comprehensive sources of backlink data on the Internet,” praising its history index, which in 2021 will have links going back 5 to 15 years.

Business customers may access this information thanks to the site’s crawler.

viii. Oncrawl

Oncrawl bills itself as the “industry-leading SEO crawler and log analyzer” for clients on the enterprise level.

Users can build customized crawl settings by setting up “crawl profiles.” These settings, such as the crawl limitations, maximum crawl speed, and more, may be saved so that the crawl can be simply repeated with the same set of restrictions.

How To Block Negative Web Crawlers?

You can decide which bots to authorize and which to blacklist once you have your crawler list.

The first step is to review your list of crawlers and specify each crawler’s user agent, complete agent string, and unique IP address. These are the main distinguishing characteristics linked to each bot.

You may perform a DNS lookup or IP match to compare the user agent and IP address in your site records. A malicious bot could try to impersonate the real one if they don’t precisely match.

Final Words - Web Crawler List

Understanding web crawlers is crucial for marketers and valuable for search engines. Your website's success depends on the suitable crawlers finding and indexing it properly. By maintaining a crawler list, you may identify which crawlers to look for when they appear in your site log. You'll make it simpler for crawlers to reach your site and index the appropriate information for search engines and the customers looking for it as you follow to the advice of commercial crawlers and enhance the content and speed of your website.

FAQs -Web Crawler List

The legality of web crawling depends on how it’s done. Always respect website terms of service and robots.txt files to stay within legal boundaries.

Web crawler bots can provide valuable data for competitive analysis, market research, and content monitoring, giving your business a competitive edge.

Challenges in web crawling include CAPTCHAs, dynamic content, and changing website structures, which require advanced techniques to overcome.

You can build custom web crawler bots or use third-party tools and services to access web crawling capabilities.

The future of web crawling may involve more intelligent bots driven by machine learning and artificial intelligence, making them more efficient and accurate.

You can deploy your bespoke web crawlers or use APIs (Application Programming Interfaces) supplied by search engines to access web crawler bots. Web crawling features are available on many third-party tools and services, opening it to a larger audience.

Web crawler bots provide many benefits but must be handled morally and responsibly. To prevent legal problems and possible website damage, it’s crucial to abide by the terms of service and robots.txt files on websites.

Web crawler bots are essential for retrieving and disseminating information. They make discovering pertinent material on the broad internet simpler by enabling search engines to provide consumers with accurate and current search results.

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Zayne is an SEO expert and Content Manager at, harnessing three years of expertise in the digital realm. Renowned for his strategic prowess, he navigates the complexities of search engine optimization with finesse, driving's online visibility to new heights. He leads's SEO endeavors, meticulously conducting keyword research and in-depth competition analysis to inform strategic decision-making.

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