formation.dev

Get an email when its DNS, website or certificate changes.

formation.dev serves a website of its own over HTTPS. It answers on IPv4 only, with a valid TLS certificate and MX records for mail.

Its busiest IP address is shared with 4 other domains, and 34 domains redirect to it.

The most recent crawl returned the page title “Technical Interview Prep | Formation SWE Interview Prep | Land Your Next SWE Role” and 110,441 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.dev	Statistics for all domains we know under this TLD.
Has website	yes	A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record	yes	The domain has an MX record.
External redirect	no	The domain redirects to another domain.
Redirect to https	yes	The domain redirects to https.
Redirect to www.	no	The domain redirects to www.domain.
Only with www.	no	The domain can only be reached with the subdomain "www".
Only DNS, no website	no	There are no A or AAAA records in DNS.
IP-Address	only IPv4	Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate	valid	Shows whether the domain has a valid SSL certificate.
Redirects	34	Number of domains that redirect to this domain.
Reverse IP	10	Number of domains with the same IP(s).

This data through the API

The data on this page is also available as JSON: /lookup for the key facts, /reverseip, /redirect and /similar for the lists, and /dnshistory with Basic and Premium. A free account comes with an API key and 100 calls a day.

curl -X POST https://api.webxtrend.com/v1.0/lookup \
  -H 'Content-Type: application/json' \
  -d '{"token": "YOUR_TOKEN", "query": "formation.dev"}'

Create a free account Read the API docs

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Websites whose start page offers something similar, found by comparing the text of their start pages, across languages. Near-identical copies, parking pages and error pages are left out. The full list of up to 100 comes through the API: similar websites.

Last SSL certificate

Issuer	Amazon
Valid from	9/27/2026
Valid to	4/13/2027
Time until expiry	171 days

Last successful crawl

Title	Technical Interview Prep \| Formation SWE Interview Prep \| Land Your Next SWE Role
Description	Technical Interview Prep \| Software Engineer Interview Prep \| Formation’s Software Engineering Interview Prep helps senior and staff-level engineers ace upcoming tech interviews and land dream roles.
Content-Length	110,441 bytes

Title and description as published by the page itself in its own <title> and <meta name="description"> tags.

DNS history

IPv4 address	First seen
75.2.21.206	12/10/2023
99.83.196.253	12/10/2023

Mail server	Priority	First seen
aspmx.l.google.com	1	12/31/2023
alt1.aspmx.l.google.com	5	12/31/2023
alt2.aspmx.l.google.com	5	12/31/2023
alt3.aspmx.l.google.com	10	12/31/2023
alt4.aspmx.l.google.com	10	12/31/2023

Name server	First seen
ns-1221.awsdns-24.org	12/10/2023
ns-1539.awsdns-00.co.uk	12/10/2023
ns-302.awsdns-37.com	12/10/2023
ns-571.awsdns-07.net	12/10/2023

The five most recent states of each record type. The full history comes through the API: DNS history.

Most recent redirect domains

Domain	Last seen
exfb.dev	10/23/2026
exmeta.dev	10/23/2026
formationcareer.info	10/22/2026
formationdeveloper.info	10/22/2026
formationpath.info	10/22/2026
formationswe.info	10/22/2026
formationprep.info	10/21/2026
formationinsight.com	10/21/2026
formationinterview.info	10/21/2026
formationengineers.com	10/21/2026
formationcode.com	10/20/2026
formationcareer.com	10/20/2026
and 22 more

Reverse IP neighbours

75.2.21.206 5 domains · here since 9/12/2026

Domain	On this IP since
recurcode.com	9/17/2026
fmtn.dev	9/12/2026
buildschool.org	9/18/2026
buildschool.io	9/19/2026

99.83.196.253 5 domains · here since 9/12/2026

Domain	On this IP since
recurcode.com	9/17/2026
fmtn.dev	9/12/2026
buildschool.org	9/18/2026
buildschool.io	9/19/2026

Sharing an address does not always mean sharing a server: on a CDN or a large hosting platform, millions of unrelated domains answer on the same few addresses. We measured how far that goes in Half the web sits on 276 IP addresses. The complete list of neighbours, also for an IP address, comes through the API: reverse IP lookup.

Dive into our data, search now!