effective.so

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

40,974,020 other domains share an IP address with it, and one domain redirects to it.

The most recent crawl returned the page title “Effective Interviews” and 73,912 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.so	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	1	Number of domains that redirect to this domain.
Reverse IP	40,974,020	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": "effective.so"}'

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	8/26/2026
Valid to	11/24/2026
Time until expiry	39 days

Last successful crawl

Title	Effective Interviews
Description	Whiteboard Tradeoffs / Scaling / Reliability Follow-up question ↗ ● AI-Powered Interview Practice Practice system design interviews like it's the real thing. Effective Interviews gives you a…
Content-Length	73,912 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
104.21.51.121	7/4/2026
172.67.180.45	7/4/2026
5.161.199.5	1/29/2026

IPv6 address	Last updated
2606:4700:3033:0:0:0:6815:3379	8/2/2026
2606:4700:3034:0:0:0:ac43:b42d	8/2/2026
2606:4700:3030:0:0:0:6815:3379	7/4/2026
2606:4700:3031:0:0:0:ac43:b42d	7/4/2026

Mail server	Priority	Last updated
eforward1.registrar-servers.com	10	1/29/2026
eforward2.registrar-servers.com	10	1/29/2026
eforward3.registrar-servers.com	10	1/29/2026
eforward4.registrar-servers.com	15	1/29/2026
eforward5.registrar-servers.com	20	1/29/2026

Name server	Last updated
dns1.registrar-servers.com	1/29/2026
dns2.registrar-servers.com	1/29/2026

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
interviewbetter.app	10/11/2026

Reverse IP neighbours

2a06:98c1:3120::3 10,201,086 domains · here since 10/15/2026

Domain	On this IP since
zzzzzzzzz.xyz	10/6/2026
zzzzzzzzum.icu	10/13/2026
zzzzzzys.com	9/19/2026
zzzzzyl1.cn	10/14/2026
zzzzzwwwppodjfdkodkloq.com	9/28/2026
zzzzzssss55.online	9/16/2026
zzzzzssss55.buzz	9/20/2026
zzzzzsss77.online	9/20/2026
zzzzzssj.com	9/14/2026
zzzzzn.com	9/20/2026
zzzzz7777.com	9/17/2026
zzzzz1.com	9/25/2026
and 10,201,073 more

2a06:98c1:3121::3 10,201,083 domains · here since 10/15/2026

Domain	On this IP since
zzzzzzzzz.xyz	10/6/2026
zzzzzzzzum.icu	10/13/2026
zzzzzzys.com	9/19/2026
zzzzzyl1.cn	10/14/2026
zzzzzwwwppodjfdkodkloq.com	9/28/2026
zzzzzssss55.online	9/16/2026
zzzzzssss55.buzz	9/20/2026
zzzzzsss77.online	9/20/2026
zzzzzssj.com	9/14/2026
zzzzzn.com	9/20/2026
zzzzz7777.com	9/17/2026
zzzzz1.com	9/25/2026
and 10,201,070 more

188.114.96.3 10,285,926 domains · here since 10/3/2026

Domain	On this IP since
zzzzzzzzz.xyz	10/6/2026
zzzzzzzzz.org	9/13/2026
zzzzzzzzum.icu	10/13/2026
zzzzzzys.com	9/19/2026
zzzzzyl1.cn	10/14/2026
zzzzzwwwppodjfdkodkloq.com	9/28/2026
zzzzzssss55.online	9/16/2026
zzzzzssss55.buzz	9/20/2026
zzzzzsss77.online	9/20/2026
zzzzzssj.com	9/14/2026
zzzzzn.com	9/20/2026
zzzzz7777.com	9/17/2026
and 10,285,913 more

188.114.97.3 10,285,925 domains · here since 10/3/2026

Domain	On this IP since
zzzzzzzzz.xyz	10/6/2026
zzzzzzzzz.org	9/13/2026
zzzzzzzzum.icu	10/13/2026
zzzzzzys.com	9/19/2026
zzzzzyl1.cn	10/14/2026
zzzzzwwwppodjfdkodkloq.com	9/28/2026
zzzzzssss55.online	9/16/2026
zzzzzssss55.buzz	9/20/2026
zzzzzsss77.online	9/20/2026
zzzzzssj.com	9/14/2026
zzzzzn.com	9/20/2026
zzzzz7777.com	9/17/2026
and 10,285,912 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!