Alternative Internet DNS services

Domain Name System service offered by Google

OpenDNS is an American company providing Domain Name System (DNS) resolution services—with features such as phishing protection, optional content filtering, and DNS lookup in its DNS servers—and a cloud computing security product suite, Umbrella, designed to protect enterprise customers from malware, botnets, phishing, and targeted online attacks. The OpenDNS Global Network processes an estimated 100 billion DNS queries daily from 85 million users through 25 data centers worldwide.

1.1.1.1 is a free Domain Name System (DNS) service by the American company Cloudflare in partnership with APNIC. The service functions as a recursive name server, providing domain name resolution for any host on the Internet. The service was announced on April 1, 2018. On November 11, 2018, Cloudflare announced a mobile application of their 1.1.1.1 service for Android and iOS. On September 25, 2019, Cloudflare released WARP, an upgraded version of their original 1.1.1.1 mobile application.

Mullvad is a commercial VPN service based in Sweden. The name "Mullvad" is the word for "mole" in the Swedish language. Mullvad operates using the WireGuard protocol. It also supports Shadowsocks as a bridge protocol for censorship circumvention. Mullvad's VPN client software is publicly available under the GPLv3, a free and open-source software license.

Namecoin (Abbreviation: NMC; sign: \mathbb{N}) is a cryptocurrency originally forked from bitcoin software. It uses proof-of-work algorithm. Like bitcoin, it is limited to 21 million coins.

AdGuard is a Cypriot company primarily offering ad blocking services. They offer dedicated ad blocking applications, browser extensions, a DNS resolver, and a VPN service.

Quad9 is a global public recursive DNS resolver that aims to protect users from malware and phishing. Quad9 is operated by the Quad9 Foundation, a Swiss public-benefit, not-for-profit foundation with the purpose of improving the privacy and cybersecurity of Internet users, headquartered in Zürich. Quad9 is entirely subject to Swiss privacy law, and the Swiss government extends that protection of the law to Quad9's users throughout the world, regardless of citizenship or country of residence.

Internet performance company

unofficial alternatives to the official DNS Root Zone

OpenNIC (also referred to as the OpenNIC Project) is a user-owned and -controlled top-level Network Information Center that offers a non-national alternative to traditional top-level domain (TLD) registries such as ICANN. As of January 2017, OpenNIC recognizes and peers all existing ICANN TLDs, for compatibility reasons. However, OpenNIC has not yet evaluated and does not hold a formal position on future ICANN TLDs.

type of name server that is available to the public, that partly gains its answers from others and may modify the reply it then gives

Vitalwerks Internet Solutions, LLC is a domain and host service provider. No-IP offers DNS services, DDNS, email, network monitoring and SSL certificates. Email services include POP3, SMTP, mail backup services, mail reflection and filtering.