What Is a Public Recursive Name Server and Its Uses

A Public Recursive Name Server is a type of DNS server that can be queried by anyone. It's a crucial part of the internet infrastructure.

It's called "recursive" because it will follow the DNS hierarchy to find the requested domain's IP address, even if it means asking other DNS servers along the way. This is in contrast to a "non-recursive" server, which will only provide information if it already has it.

Public Recursive Name Servers are typically operated by Internet Service Providers (ISPs) or large organizations, and they can be accessed by anyone on the internet. They're usually configured to handle a large volume of queries, making them a reliable choice for users.

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Public DNS is a public recursive name server that provides stable and secure resolution services for apps and IoT devices. It supports protocols like HTTP, HTTPS, DoH, and DoT.

Public DNS acts as a middleman between your device and the internet, resolving domain names in real-time. It prevents issues like domain hijacking and slow resolution.

Public DNS offers two sets of IP addresses, one for IPv4 and one for IPv6. The IPv4 addresses are 223.5.5.5 and 223.6.6.6, while the IPv6 addresses are 2400:3200::1 and 2400:3200:baba::1.

Public DNS helps keep your mobile devices safe by preventing domain hijacking and ensuring higher security.

For another approach, see: DNS Hijacking

A public recursive name server is a type of server that resolves domain queries for clients in a matter of milliseconds.

To put it simply, it's like a librarian who helps you find a book on the shelf. You ask the librarian for the book, and they search through their catalog to find the correct location.

Here's a step-by-step breakdown of how a recursive DNS server operates:

This process often takes just milliseconds.

A recursive DNS server queries other servers or its cache to resolve domain queries, which is a key difference from an authoritative DNS server.

Let's take a look at the key features of a recursive DNS server in the table below:

These features are similar to Google's 8.8.8.8 or Cloudflare's 1.1.1.1, which are well-known examples of public recursive name servers.

Public recursive name servers are a great way to access the internet. They're like a shortcut to the internet's address book.

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There are several popular recursive DNS services available. Google Public DNS, for example, offers two addresses: 8.8.8.8 and 8.8.4.4.

Cloudflare DNS is another option, with addresses 1.1.1.1 and 1.0.0.1. It's known for its fast response times and built-in security features.

Here's a list of some popular recursive DNS services:

Public DNS supports protocols such as HTTP, HTTPS, DoH, and DoT, which ensure higher security than the UDP protocol.

With Public DNS, you can bypass local DNS servers of ISPs to prevent domain hijacking and cache pollution.

Public DNS greatly improves client experience in accessing domain names and increases resolution success rates.

It achieves zero resolution latency by caching DNS results on SDK clients.

Public DNS allows users around the world to access nearby nodes, accelerating DNS resolution.

There are 29 DNS clusters and over 150 recursive nodes globally, with 16 clusters deployed outside the Chinese mainland.

Public DNS triggers updates to data within seconds when changes occur in the DNS record of public authoritative domain names hosted by Alibaba Cloud DNS.

The concurrent update feature helps DNS record changes quickly take effect on clients in fault scenarios.

Public DNS supports precise scheduling for authoritative DNS servers based on source IP addresses.

Public DNS provides statistics on DNS requests, allowing you to view the trend of DNS requests and top domain names with the largest number of DNS requests.

Public DNS also provides a DNS response detailed log for each DNS request to help troubleshoot during O&M.

Public DNS guarantees a 99.99% availability for resolution services in the Service Level Agreement (SLA) and provides over 150 nodes around the world for disaster recovery.

The Public Recursive Name Server, also known as a root name server, is a critical component of the Domain Name System (DNS) that translates human-readable domain names into IP addresses.

Hurricane Electric, a well-known internet backbone provider, operates a significant number of public recursive name servers.

One of these servers is located at 216.66.86.114, which is also identified as the IPv6 address 2001:470:0:220::2.

This server is part of the tserv1.ber1.he.net cluster, indicating its location in Berlin, Germany.

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OpenAS36692 is operated by OpenDNS, a well-known provider of public recursive name servers.

The IP addresses for OpenDNS's public recursive name servers are 208.67.222.222 and 2620:119:35::35.

These IP addresses can be used by users to configure their devices to use OpenDNS's services.

OpenDNS also provides IPv6 support through IP addresses like 2620:0:ccc::2.

The IP addresses 208.67.220.220 and 2620:119:53::53 are also used by OpenDNS for its public recursive name servers.

OpenDNS has multiple resolvers, including resolver3.opendns.com with IP address 208.67.222.220.

Another resolver, resolver4.opendns.com, has the IP address 208.67.220.222.

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AS6233 is the American Registry for Internet Numbers (ARIN) assigned name server that provides public recursive name service, allowing users to resolve domain names to IP addresses.

This service is based on the Internet Engineering Task Force (IETF) standardized protocol, which enables users to query the name server for domain name resolution.

AS6233 is a critical component of the public recursive name server, providing a centralized service for users to access the internet.

It is a free service, available to anyone with an internet connection, making it an essential tool for online communication and information sharing.

By using AS6233, users can resolve domain names quickly and efficiently, without the need for individual name servers.

Freenom World AS60679 is a public recursive name server operated by Freenom, a company that provides free domain names. It's a popular choice among users due to its high uptime and reliability.

Freenom World AS60679 uses the IP address 94.136.32.2. This IP address is used to resolve domain names to their corresponding IP addresses.

Freenom World AS60679 is a recursive name server, which means it can perform recursive DNS lookups on behalf of the user's device. This allows for faster and more efficient domain name resolution.

Freenom World AS60679 supports both IPv4 and IPv6, making it accessible to a wide range of users.

Quad101 AS131621 is a public recursive name server that plays a crucial role in the Domain Name System (DNS). It's a key component in the internet infrastructure, helping to translate human-readable domain names into IP addresses.

Quad101 AS131621 is operated by Quad9, a non-profit organization that aims to improve internet security and user safety. This organization is committed to providing a free and secure DNS service to the public.

Quad101 AS131621 is a public recursive name server that uses a global anycast network to provide fast and reliable DNS resolution. This network is designed to ensure that users receive the best possible DNS service, regardless of their location.

The Quad101 AS131621 server is configured to block known malicious domains and IP addresses, helping to protect users from online threats. This feature is a key part of Quad9's mission to improve internet security and user safety.

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Level 3 [AS3356] is a well-established player in the world of public recursive name servers. They operate a robust network of DNS servers, with multiple resolvers and tertiary servers.

The Level 3 DNS network includes resolvers such as resolver1.level3.net (209.244.0.3) and resolver2.level3.net (209.244.0.4). These resolvers help to direct internet traffic to its final destination.

Level 3 also uses tertiary servers like tserv1.den1.he.net (184.105.250.46/2001:470:0:24b::2), which help to distribute traffic and improve performance.

Their network includes multiple IP addresses, such as 4.2.2.1 (a.resolvers.level3.net), 4.2.2.2 (b.resolvers.level3.net), and 4.2.2.3 (c.resolvers.level3.net), which can be used for DNS lookups.

The Level 3 DNS network also spans across different geographic locations, with servers like tserv1.lon2.he.net (216.66.88.98) and tserv1.prg1.he.net (216.66.86.122/2001:470:0:221::2) serving European regions.

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MSK-IX [AS8985] is a public recursive name server.

MSK-IX is operated by Moscow eXchange, a Russian internet exchange point.

It's located in Moscow, Russia, and provides a public recursive name server service.

The AS number for MSK-IX is AS8985.

MSK-IX is one of the many public recursive name servers available.

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Many public DNS service providers struggle to support high-volume input/output and caching, and adequately balance load among their servers. Google Public DNS, on the other hand, uses large, Google-scale caches and load-balances user traffic to ensure shared caching.

This approach lets Google Public DNS answer a large fraction of queries from cache. Google has also implemented several recommended solutions to help guarantee the authenticity of the responses it receives from other name servers.

To defend against spoofing attacks and denial-of-service (DoS) attacks, Google has implemented full support of the DNSSEC protocol, adding entropy to requests, and rate-limiting client traffic.

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Performance is key to a smooth online experience. Many DNS service providers struggle to support high-volume input/output and caching, leading to poor performance.

Google Public DNS uses large caches, which helps answer a large fraction of queries from cache. This approach is crucial for handling high traffic volumes.

Adequate load balancing among servers is also essential for optimal performance. Unfortunately, many DNS service providers fail to achieve this, resulting in slow response times.

Google Public DNS, on the other hand, effectively balances user traffic to ensure shared caching. This helps distribute the load and prevents any single server from becoming overwhelmed.

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As a user, you want to know that your DNS service is secure, right? DNS is vulnerable to various kinds of spoofing attacks that can "poison" a name server's cache and route its users to malicious sites.

Google has implemented several recommended solutions to help guarantee the authenticity of the responses it receives from other name servers, and to ensure their servers are not used for launching DoS attacks. These include adding entropy to requests, rate-limiting client traffic, and more.

Google Public DNS may not resolve certain domains if they believe this is necessary to protect their users from security threats. For more information, see the page on security benefits.

You can choose from several secure DNS providers that offer DNS-over-TLS (DoT) or DNS-over-HTTPS (DoH) services. Here are some options:

These providers offer additional security features such as filtering policies and SPKI pin authentication. For example, Quad9 does not publish or recommend use of SPKI pins with their servers, while Cloudflare also does not publish or recommend use of SPKI pins with their servers.

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Google Public DNS is designed to return the right answer to every query every time, following DNS standards. It's not perfect, but it does its best to provide accurate results.

In cases where a domain name is mistyped or non-existent, Google Public DNS will return no answer or an error message stating the domain name could not be resolved. I've experienced this firsthand when trying to access a non-existent website.

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Google Public DNS may also choose not to resolve certain domains if it believes this is necessary to protect its users from security threats. This is a deliberate decision to keep users safe online.

Unlike some open resolvers and ISPs, Google Public DNS never redirects users to a different server or website. This means you'll always get the answer you're looking for, without any unwanted surprises.

Google Public DNS is a widely used recursive DNS service, with IP addresses 8.8.8.8 and 8.8.4.4. These services often offer faster response times and built-in security features.

Cloudflare DNS is another popular option, with IP addresses 1.1.1.1 and 1.0.0.1. They also offer faster response times and security features.

OpenDNS (Cisco) is a well-known service, with IP addresses 208.67.222.222 and 208.67.220.220. Quad9 DNS is also widely used, with a single IP address 9.9.9.9.

Here are some popular recursive DNS servers:

Yandex [As13238] is a popular server among web developers. It's known for its high speed and reliability.

Yandex is a Russian technology company that offers a range of services, including a search engine and a map service. Its server, As13238, is used by many websites.

As13238 is a Class A IP address, which means it's a high-level address used by large organizations. It's also a transit IP, which allows it to route traffic between different networks.

Many websites use As13238, including popular Russian websites like Yandex itself.

Cloudflare [AS13335] is a popular choice for those seeking a reliable recursive DNS service. Their IP addresses are 1.1.1.1 and 1.0.0.1, with corresponding IPv6 addresses 2606:4700:4700::1111 and 2606:4700:4700::1001.

These IP addresses are associated with the domain name 1dot1dot1dot1.cloudflare-dns.com. You can use these addresses to switch to Cloudflare's DNS service.

One of the unique features of Cloudflare's DNS service is its support for DNS64, which allows for the translation of IPv4 addresses to IPv6 addresses. Their DNS64 addresses are 2606:4700:4700::64 and 2606:4700:4700::6400.

Cloudflare also offers a public DNS service with the IP address 185.222.222.222, which has a corresponding IPv6 address 2a09::.

Here's a list of Cloudflare's IP addresses and corresponding IPv6 addresses:

Public DNS is used by a wide variety of clients, including game and news apps, which load content and respond faster thanks to reduced latencies.

Game and news apps benefit significantly from Public DNS, as it helps them load content quickly and respond in a faster way.

Audio and video apps, on the other hand, enjoy smoother video playback and improved user satisfaction due to Public DNS.

Financial and payment apps also rely on Public DNS to improve security and network stability during transactions.

Here are some examples of typical apps that use Public DNS:

NTT is a Japanese telecommunications company that has been around since 1952. It's one of the world's largest telecommunications companies.

NTT offers a range of services, including cloud computing, cybersecurity, and data analytics. These services are designed to help businesses and organizations manage and protect their data.

NTT's cloud computing services are built on top of its own data centers, which are located all over the world. This allows NTT to provide fast and reliable access to cloud-based resources.

NTT's cybersecurity services use advanced technologies like AI and machine learning to detect and prevent cyber threats. This helps businesses and organizations protect their data and systems from harm.

NTT's data analytics services use big data and analytics to help businesses and organizations make better decisions.

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Public recursive name servers are built with key features that enhance performance and security. Caching is one such feature that saves previously looked-up domain results to speed up future requests and reduce overall DNS traffic.

Recursive name servers also use performance optimization techniques like prefetching to anticipate user needs, making the overall browsing experience smoother.

Some public recursive name servers integrate with DNSSEC to ensure response authenticity and protect against DNS spoofing attacks, which can be a major security threat.

Here are some key features of public recursive name servers:

Recursive DNS servers are a game-changer for online browsing. They cache DNS responses to speed up future requests and reduce overall DNS traffic. This caching technique is a key feature of recursive DNS servers.

Some recursive servers also offer performance optimization techniques like prefetching to anticipate user needs. This can result in faster browsing and a more seamless online experience.

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Security is another crucial aspect of recursive DNS servers. Many of them integrate with DNSSEC to ensure response authenticity and protect against DNS spoofing attacks. This is a significant advantage in today's online landscape.

Traffic management is another feature offered by some advanced resolvers. This can include load balancing or filtering options, such as parental controls or malware blocking. This can help ensure a safer and more controlled online environment.

Here's a breakdown of some popular recursive DNS servers:

These services often offer faster response times, built-in security features, and privacy-focused policies. This can result in a more efficient and secure online experience.

AdGuard launched the first DoQ public resolver in 2020.

DoQ is a protocol that combines the security benefits of DNS-over-TLS with the performance and reliability of QUIC.

In 2020, AdGuard took the initiative to launch the first DoQ public resolver.

This resolver allows users to access a secure and fast DNS service using the DoQ protocol.

The benefits of using DoQ include improved security and faster data transfer times.

AdGuard's DoQ public resolver is a significant milestone in the development of this protocol.

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Google Public DNS is a recursive DNS resolver, similar to other publicly available services. It's designed to provide many benefits, including improved security, fast performance, and more valid results.

Google Public DNS is not a hosting service, it's a resolver that helps you find the IP address of a website when you enter its domain name. This is a key difference between a resolver and a hosting service.

Google Public DNS is a free service, but other providers may offer paid options with additional features.

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Google AS15169 is a well-known player in the DNS world. Their public DNS servers are a popular choice for many users.

Google's public DNS servers are located at 8.8.8.8/2001:4860:4860::8888 and 8.8.4.4/2001:4860:4860::8844, which can also be accessed through the hostnames google-public-dns-a.google.com and google-public-dns-b.google.com.

These servers are often used for their speed and reliability, which is why many people prefer them over other options.

Google Public DNS is a recursive DNS resolver, similar to other publicly available services.

It provides many benefits, including improved security, fast performance, and more valid results.

Google Public DNS is a service that offers a faster and more secure way to resolve domain names.

I've personally experienced faster loading times when using Google Public DNS.

Google Public DNS is not a service that provides all the benefits of a traditional DNS resolver.

It's a specialized service that excels in specific areas, like speed and security.

Google Public DNS is not a service that resolves domain names on its own.

It relies on a network of servers to provide the best possible results.