WhoisXML API Blog

DNS Security Best Practices from the NIST Secure Deployment Guide (SP 800-81r3 Initial Public Draft)

Often dubbed as the Internet’s phonebook, the DNS serves a critical function in modern Internet communications, translating human-readable domain names into IP addresses. We have a primer on the subject if you want to dig deeper into the DNS, how it works, and other related concepts.

Given its foundational role, it’s no surprise that threat actors often target the DNS. According to the Cybersecurity & Infrastructure Security Agency (CISA), “DNS infrastructures are common threat vectors for attacks.” It is within this context that the U.S. National Institute of Standards and Technology (NIST) published an initial public draft of the third Secure DNS Deployment Guide (NIST SP 800-81r3 ipd) in April 2025.

RSA Conference 2025: Emerging Trends and Key Insights

The RSA Conference held in San Francisco from 28 April to 1 May 2025 attracted a record-breaking 41,000 attendees, and we’re thrilled to say that WhoisXML API representatives were among them. The global cybersecurity gathering featured 413 sessions and 656 exhibitors, all offering valuable insights into emerging cybersecurity trends—evolving threats, cutting-edge solutions, and industry best practices.

In this post, we’ll recap the recurring themes and key trends from the event and highlight the most impactful insights that will continue to shape organizations’ cybersecurity strategies.

WhoisXML API Participates in Cybersec 2025

Ching Chiao, Head of APAC & Global Partnership at WhoisXML API, joined more than 20,000 security professionals from around the world in the recently concluded Cybersec 2025. He participated as a speaker at the three-day conference and expo that aims to take on digital threats as one cybersecurity community.

Held in Taiwan on 15–17 April 2025, Cybersec 2025 hosted more than 300 sessions and speakers and focused on 28 various themes, including artificial intelligence (AI), cloud, AI of Things (AIoT) and hardware, financial technology (fintech), and open-source security. Several of the topics resonated with us, and we’ll dive into some of them in this post.

Upgraded Web Interfaces for All Lookup Tools

We’re excited to introduce upgraded web tool interfaces with enhanced data access across all our lookup tools. The improved GUIs are designed to make your lookup reports richer and simpler to use for investigations and testing, improving how technical and nontechnical users access and utilize domain, DNS, IP, and other cyber data accessible through this complete list of our lookup tools.

Here are the new features available to all logged-in users with credits.

April 2025: Domain Activity Highlights

The WhoisXML API research team analyzed 7.6+ million domains registered between 1 and 30 April 2025 to identify the most popular registrars, top-level domain (TLD) extensions, and other global domain registration trends.

We also determined the top TLD extensions used by 55.8+ billion domains from our DNS database’s A record full file dated 3 April 2025.

Next, we studied the top TLDs of 1.5+ million domains detected as indicators of compromise (IoCs) this April.

Finally, we summed up our findings and provided links to the threat reports produced using DNS, IP, and domain intelligence sources during the period.

Python Script for Capturing Reverse NS API’s Full Output

WhoisXML API has recently created a Python script to help Reverse NS API users capture the entire query output without being restricted to 300 results through automatic pagination.

The script essentially removes the limitation of standard API pagination, automatically retrieving all subsequent pages of the query output instead of the user manually requesting each page. This capability enables users to fully automate processes and pipelines that rely on Reverse NS API data.

WhoisXML API Ranks in the Financial Times Top Fastest-Growing Companies in 2025

WhoisXML API is proud to be recognized once again in the annual edition of The Americas’ Fastest-Growing Companies in 2025 by the Financial Times in collaboration with Statista.

This year’s list was based on the revenue growth of the top companies in the Americas between 2020 and 2023, placing WhoisXML API at rank 225, a consistent climb in the past four years. The company secured a spot on the esteemed list—494th in 2022, 436th in 2023, and 359th in 2024.

“Our consistent inclusion in the Financial Times list affirms our growth trajectory. This success is fueled by our commitment to providing market-leading Internet infrastructure intelligence that empower thousands of organizations to operate with confidence and security in the digital world,” says WhoisXML API CEO Jonathan Zhang.

Subdomain Database Coverage Expands from 2.3B to 9.6B Subdomains

In line with our commitment to continuous improvement, we recently expanded the data coverage of Subdomains Database Download from an average of 2.3 billion to more than 9.6 billion subdomain records, as seen in our latest weekly full files. This coverage enhancement is a direct result of techniques employed to optimize data processing and storage efficiency, with our development team focusing on improving data indexing and retrieval, as well as enhancing resolving processes—overall enabling faster lookups and more accurate results for our database.