underattack.sh

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

underattack.sh serves a website of its own. It answers on both IPv4 and IPv6, with a valid TLS certificate and MX records for mail.

3,312 other domains share an IP address with it.

The most recent crawl returned the page title “UnderAttack — Backend Development, Automation & Security” and 13,536 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.sh	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	no	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	0	Number of domains that redirect to this domain.
Reverse IP	3,312	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": "underattack.sh"}'

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	Google Trust Services
Valid from	10/13/2026
Valid to	1/11/2027
Time until expiry	83 days

Last successful crawl

Title	UnderAttack — Backend Development, Automation & Security
Description	UnderAttack builds backend systems, APIs and automation engineered to survive production — security-first, by default.
Content-Length	13,536 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
104.21.80.162	6/21/2026
172.67.151.120	6/21/2026

IPv6 address	Last updated
2606:4700:3033:0:0:0:6815:50a2	6/30/2026
2606:4700:3036:0:0:0:ac43:9778	6/30/2026
2606:4700:3036:0:0:0:6815:50a2	6/21/2026
2606:4700:3037:0:0:0:ac43:9778	6/21/2026

Mail server	Priority	Last updated
route2.mx.cloudflare.net	16	6/21/2026
route1.mx.cloudflare.net	51	6/21/2026
route3.mx.cloudflare.net	97	6/21/2026

Name server	Last updated
kevin.ns.cloudflare.com	2/1/2026
nina.ns.cloudflare.com	2/1/2026

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

Most recent redirect domains

No domains found.

Reverse IP neighbours

104.21.80.162 834 domains · here since 9/21/2026

Domain	On this IP since
zyrodex.com	10/5/2026
zqpdemo.com	9/19/2026
zpan.ca	9/15/2026
zjhysb.cn	10/12/2026
zhongren.cc	9/16/2026
zhifusw.wiki	10/10/2026
zh-home-duoduo.com.cn	9/22/2026
zgpdc.com	9/19/2026
zg-haixing-mgtv.com	9/20/2026
zbetvn.top	9/22/2026
zanlavnetia.eu	10/10/2026
yumgaze.info	9/16/2026
and 821 more

172.67.151.120 834 domains · here since 9/21/2026

Domain	On this IP since
zyrodex.com	10/5/2026
zqpdemo.com	9/19/2026
zpan.ca	9/15/2026
zjhysb.cn	10/12/2026
zhongren.cc	9/16/2026
zhifusw.wiki	10/10/2026
zh-home-duoduo.com.cn	9/22/2026
zgpdc.com	9/19/2026
zg-haixing-mgtv.com	9/20/2026
zbetvn.top	9/22/2026
zanlavnetia.eu	10/10/2026
yumgaze.info	9/16/2026
and 821 more

2606:4700:3033::6815:50a2 822 domains · here since 9/21/2026

Domain	On this IP since
zyrodex.com	10/5/2026
zqpdemo.com	9/19/2026
zpan.ca	9/15/2026
zjhysb.cn	10/12/2026
zhongren.cc	9/16/2026
zhifusw.wiki	10/10/2026
zh-home-duoduo.com.cn	9/22/2026
zgpdc.com	9/19/2026
zg-haixing-mgtv.com	9/20/2026
zbetvn.top	9/22/2026
zanlavnetia.eu	10/10/2026
yumgaze.info	9/16/2026
and 809 more

2606:4700:3036::ac43:9778 822 domains · here since 9/21/2026

Domain	On this IP since
zyrodex.com	10/5/2026
zqpdemo.com	9/19/2026
zpan.ca	9/15/2026
zjhysb.cn	10/12/2026
zhongren.cc	9/16/2026
zhifusw.wiki	10/10/2026
zh-home-duoduo.com.cn	9/22/2026
zgpdc.com	9/19/2026
zg-haixing-mgtv.com	9/20/2026
zbetvn.top	9/22/2026
zanlavnetia.eu	10/10/2026
yumgaze.info	9/16/2026
and 809 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!