List of Domains Using Fastmail DNS

Fastmail DNS Domain Datasets

Download a domain name list or full dataset of domains using Fastmail nameservers (*.messagingengine.com).

DNS Provider: Fastmail

Nameserver pattern: *.messagingengine.com

Update frequency: daily

Last updated: October 21, 2026

Domains included in datasets: 52,133

Datasets available:
Basic Domain List (download sample 💾)
Detailed Domain Dataset (download sample 💾)

Domains Using Fastmail DNS

Domains seen active in the last 7 days on Fastmail nameservers, per day, last 30 days.

The downloadable list holds all 52,133 domains on these nameservers, including ones not seen active recently. Y-axis scaled to the data range, not from zero.

Dataset type
choose a type		 Last updated
next update: tomorrow 		Total domains
as of last update		 Emails
crawled from websites 		Phones
crawled from websites 		CSV
Basic DNS Domain List October 21, 2026 52,133 --- --- Download GET
Detailed DNS Domain Dataset October 21, 2026 52,133 YES YES Download GET

Frequently Asked Questions

See our FAQ for more answers.

Can I download sample files?

Yes. Download a sample domain list or a sample detailed dataset with .com domains that use Fastmail nameservers.

What is a basic DNS domain list, and how does it differ from a detailed dataset?

Both cover the same 52,133 domains using Fastmail nameservers. A basic list is one domain name per line in a gzip CSV. A detailed dataset adds DNS servers, server IP, hostname, emails, phone numbers, and more. See the dataset format details.

How do I automate daily downloads?

Schedule automatic downloads through the API. See the API documentation for authentication and endpoints.

Are emails and phone numbers available for every domain?

No. We collect contact details from public websites when available. Many domains have no published email or phone, and we do not guarantee these fields on every row. Do not use the data for unsolicited bulk outreach.

Questions? See our FAQ or contact us.