MX Lookup Tool - Check your DNS MX Records online - MxToolbox

DNS Lookup - Check All DNS records for any domain

Instant DNS Lookup. Check DNS records and propagation globally.

ICANN Lookup

The ICANN registration data lookup tool gives you the ability to look up the current registration data for domain names and Internet number resources.

Useful utilities and toys over DNS

Free and useful services over DNS accessible on command line

Setting up a free *.city.state.us locality domain

In the US, you can get a domain name like `somename.city.state.us` for free. If your town has its own domain, you can get nameservers from Amazon Lightsail, send the *Interim .US Domain Template* to the delegated manager for your locality, then point DNS entries at your webhost.

Dynamic DNS (DDNS) for Home Server and VPS etc, Free!

Free Dynamic DNS (DDNS) by POP3,IMAP4,FTP,HTTP-BASIC for Home Server, Webcam, VPS. You can use many free sub domain, .jp, .net, .asia, etc.. DynDNS is not free

mess with dns

It's fun to learn by experimenting and breaking things! Here you can do weird DNS experiments with no consequences if you mess something up.

Buy a domain name - Register cheap domain names from $0.99 - Namecheap

Register domain names at Namecheap. Buy cheap domain names and enjoy 24/7 support. With over 18 million domains under management, you know you’re in good hands.

Contact Verification Suspension Page

This domain has a pending ICANN verification and is suspended.

Search · Marque

A domain registrar built on the AT Protocol. Made for the open web.

Have I Been Pwned: Check if your email address has been exposed in a data breach

Search tens of billions of breached records, monitor corporate domains via API, and get alerted when credentials are exposed. Trusted by security teams, MSSPs, and government agencies worldwide.

Stop Telling Users Their DNS Is Wrong

If you’re like me, you’ve had the experience where you add a DNS record for a service. You triple check it. The app still says it’s invalid. You wait. You check again. Still invalid. You start wondering if you did something wrong. You didn’t. The app is just checking DNS the wrong way. If you’re building a product that asks users to add DNS records, please take the time to verify DNS records in the correct way.

An MCP server for Fastmail — National Email Day

Connect your preferred AI client to Fastmail using MCP

<nettime> DNS: A Short History and a Short Future (2/2)

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Free Email Forwarding for Custom Domains - #1 Open Source Email Service 2026

Get free email forwarding for custom domains. Send & receive as you@yourdomain.com with unlimited aliases, 10GB storage, IMAP/POP3/SMTP & 100% open-source security. Trusted by 500K+ users. Setup in 2 minutes.

Address Lookup - iroh

Use this file to discover all available pages before exploring further.