Computers

Tool to checks DNS zone files, including SOA, NS, A, CNAME, MX, and TXT records, and show how a domain is propagated.

Web based tool for monitoring DNS records, requesting DNS updates, and troubleshooting DNS issues.

Domain name and ip address tools for DNS Lookup (nslookup), Reverse DNS Lookup (rDNS), Whois, and Traceroute. IPv4, IPv6, DMARC, and FCrDNS (forward confirmed reverse dns) lookups supported.

Provides basic forward and reverse DNS lookups, as well as MX record and server software lookups.

Provides a free DNS report on a domain name, verifying that DNS hosting is working properly. Includes over 40 different tests.

A web version of dig. Allows queries for a domain's DNS from any machine on the Internet.

Handy web-based DNS lookup service, with links.

Web-based nslookup tool that lets you look up IP address information. Query their and other DNS domain name servers to look up and find IP address information of computers on the internet.

Check the delegation of your domain. Has interesting graphical results.

Collection of DNS related tools and information.

More than twenty network testing tools such as domain health check, IP neighbours, DNS query etc. with concise explanations. The site also has a forum.

Provides information about domain names and web hosting. Other tools include an IP subnet calculator and Internet speedtest.

Free online DNS tools and utilities: DNS lookup, Reverse DNS, Geo IP, WhoIs, Blocking list lookup.

Whois lookup, DNS lookup, DNS verification, IP lookup, Reverse IP lookup.

Checks the current state of propagation of a domain name on a selection of random name servers located around the world.

Various IP, DNS and e-mail tools, Whois, Traceroute, Ping, SEO toools. Site contains browser addons, too.

Creates a DNS LOC record, which is meant to express the geographic location information for a domain name.

Discloses websites with the same advertising and statistic codes, IP addresses, DNS servers.

Checks the health and configuration of a domain name and provides a detailed report.

Complete DNS traversal check. Shows every DNS server that is (or maybe) used for a DNS lookup.

Free DNS reports with IPv6 support, more than 50 tests organized into parent, NS, SOA, MX, mail and web sections.

Various free tools: DNS lookup, blacklist check, SMTP diagnostics and others.

An online tool enables the monitoring of DNS propagation around the world by interrogating various domain name servers.

Online nameserver query with a large number of options.