RDAP vs WHOIS For Domain Lookups


RDAP heralds a new era of accurate, secure, and advanced access to information about domain names, IP addresses, and network protocols, paving the way for a brighter future of the internet.

RDAP and WHOIS are two different protocols for querying databases for information about domain names, IP addresses, and network protocols. While WHOIS has been the standard for many years, RDAP (Registration Data Access Protocol) and WHOIS (Worldwide Health Organization Information System) are two distinct methods for accessing databases for information about domain names, IP addresses, and network protocols. WHOIS has been the dominant protocol for years, but RDAP is a newer, modern, and more advanced option that offers several benefits over WHOIS.

RDAP was designed as a replacement for WHOIS because of the increasing limitations of WHOIS that became more pronounced as the internet evolved. WHOIS was created in the early days of the internet and has not been updated to keep up with the changing needs of the internet community. RDAP was developed to address these limitations and improve upon the functionality of WHOIS. It provides more features, improved security, and better data accuracy.

Improved Functionality

RDAP offers improved functionality over WHOIS. It allows users to retrieve more detailed information about domain names, IP addresses, and network protocols. Additionally, RDAP provides access to additional information that is not available through WHOIS, such as domain name registration dates, registrar information, and contact information for domain name registrants.

Improved Security

RDAP provides improved security compared to WHOIS because it uses HTTPS for all communications, which encrypts all transmitted data. This protects sensitive information from being intercepted and misused by malicious actors.

Better Data Accuracy

RDAP provides more accurate data compared to WHOIS because it requires registries and registrars to maintain up-to-date information in their databases. It also provides a mechanism for domain name registrants to update their own information, which helps to ensure that the data remains accurate and up-to-date.


RDAP is an IETF (Internet Engineering Task Force) standard, which means that it has been developed and reviewed by a group of experts from around the world. This level of standardization is not present in WHOIS, which is not a standard protocol. The standardization of RDAP helps to ensure that data can be easily accessed and understood by all users, regardless of location or technical expertise.


The adoption of RDAP has been increasing as more organizations recognize its advantages over WHOIS. The European Registry for Internet Domains (EURid), for example, has been using RDAP since 2018, providing access to information about over 3 million domain names. Other top-level domain registries, such as the Public Interest Registry (PIR) and the Internet Assigned Numbers Authority (IANA), have also adopted RDAP.

Future of RDAP

As RDAP continues to be adopted by more organizations and becomes the preferred protocol for querying domain name, IP address, and network protocol information, it is likely that WHOIS will become obsolete. The standardization of RDAP, combined with its improved functionality, security, and data accuracy, make it the better choice for accessing information about internet domains and protocols.


RDAP offers several advantages over WHOIS, including improved functionality, security, data accuracy, and standardization. With the increasing adoption of RDAP, it is clear that it is the future of querying domain name, IP address, and network protocol information. WHOIS, while still in use, is becoming a legacy protocol that will eventually be replaced by RDAP.

As the internet continues to evolve and become more complex, the need for accurate and secure access to information about domain names, IP addresses, and network protocols will only increase. RDAP offers a solution to these needs, providing a more advanced and reliable method for accessing this information. The future of RDAP looks bright, and it is likely to play an increasingly important role in the functioning of the internet in the coming years.