readermode.io

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

readermode.io serves a website of its own over HTTPS. It answers on both IPv4 and IPv6, with a valid TLS certificate and MX records for mail.

4,120 other domains share an IP address with it, and one domain redirects to it.

The most recent crawl returned the page title “Reader Mode — Distraction-Free & Accessible Reader” and 138,050 bytes of HTML. The site links to X.

Domain properties

Property	Value	Explanation
Top-level domain	.io	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	Both	Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate	valid	Shows whether the domain has a valid SSL certificate.
Redirects	1	Number of domains that redirect to this domain.
Reverse IP	4,120	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": "readermode.io"}'

Create a free account Read the API docs

Similar websites

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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	Google Trust Services
Valid from	9/10/2026
Valid to	12/9/2026
Time until expiry	50 days

Last successful crawl

Title	Reader Mode — Distraction-Free & Accessible Reader
Description	Reader Mode turns cluttered webpages into a distraction-free reading experience with text controls, reading rulers, text-to-speech, focus tools and PDF support.
Content-Length	138,050 bytes

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

DNS history

IPv4 address	Last updated
104.21.18.119	12/9/2023
172.67.181.206	12/9/2023

IPv6 address	Last updated
2606:4700:3033:0:0:0:6815:1277	6/26/2026
2606:4700:3034:0:0:0:ac43:b5ce	6/26/2026
2606:4700:3031:0:0:0:ac43:b5ce	12/9/2023
2606:4700:3034:0:0:0:6815:1277	12/9/2023

Mail server	Priority	Last updated
mxa.mailgun.org	10	1/22/2025
mxb.mailgun.org	10	1/22/2025
gmr-smtp-in.l.google.com	5	7/22/2024
alt1.gmr-smtp-in.l.google.com	10	7/22/2024
mxa.eu.mailgun.org	10	7/22/2024

Name server	Last updated
adi.ns.cloudflare.com	12/9/2023
lakas.ns.cloudflare.com	12/9/2023

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
chromereader.com	8/31/2025

Reverse IP neighbours

104.21.18.119 1,033 domains · here since 9/22/2026

Domain	On this IP since
zy888.app	9/22/2026
zuzanahaasova.sk	9/19/2026
zuowou.id	9/16/2026
zsfesj.icu	9/17/2026
zpnzpk.com	9/21/2026
zmaxka.cn	9/15/2026
zgsucai.com	10/1/2026
zeymin.com	9/19/2026
zerot.online	10/16/2026
zenithallbeaconunion.info	9/29/2026
zeminusta.com.tr	10/5/2026
zefm.click	9/13/2026
and 1,020 more

172.67.181.206 1,033 domains · here since 9/22/2026

Domain	On this IP since
zy888.app	9/22/2026
zuzanahaasova.sk	9/19/2026
zuowou.id	9/16/2026
zsfesj.icu	9/17/2026
zpnzpk.com	9/21/2026
zmaxka.cn	9/15/2026
zgsucai.com	10/1/2026
zeymin.com	9/19/2026
zerot.online	10/16/2026
zenithallbeaconunion.info	9/29/2026
zeminusta.com.tr	10/5/2026
zefm.click	9/13/2026
and 1,020 more

2606:4700:3033::6815:1277 1,027 domains · here since 9/22/2026

Domain	On this IP since
zy888.app	9/22/2026
zuzanahaasova.sk	9/19/2026
zuowou.id	9/16/2026
zsfesj.icu	9/17/2026
zpnzpk.com	9/21/2026
zmaxka.cn	9/15/2026
zgsucai.com	10/1/2026
zeymin.com	9/19/2026
zerot.online	10/16/2026
zenithallbeaconunion.info	9/29/2026
zeminusta.com.tr	9/23/2026
zefm.click	9/13/2026
and 1,014 more

2606:4700:3034::ac43:b5ce 1,027 domains · here since 9/22/2026

Domain	On this IP since
zy888.app	9/22/2026
zuzanahaasova.sk	9/19/2026
zuowou.id	9/16/2026
zsfesj.icu	9/17/2026
zpnzpk.com	9/21/2026
zmaxka.cn	9/15/2026
zgsucai.com	10/1/2026
zeymin.com	9/19/2026
zerot.online	10/16/2026
zenithallbeaconunion.info	9/29/2026
zeminusta.com.tr	9/23/2026
zefm.click	9/13/2026
and 1,014 more

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!