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382.4 M

Registered domains

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New domains in the last 30 days

64.9 M

Social media profiles detected

flat221b.com

flat221b.com serves a website of its own. It answers on IPv4 only, with no TLS certificate.

738 other domains share an IP address with it, and 2 domains redirect to it.

The most recent crawl returned the page title “221b | Writing from Jonathan Lu” and 3,618 bytes of HTML. webXtrend first recorded it on .

Domain properties

Property Value Explanation
First seen 10/5/2013 Date the domain was first seen.
Has website yes A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record no 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 only IPv4 Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate no certificate Shows whether the domain has a valid SSL certificate.
Redirects 2 Number of domains that redirect to this domain.
Reverse IP 738 Number of domains with the same IP(s).

Detected social media networks

No social networks found on this website.

Last successful crawl

Title 221b | Writing from Jonathan Lu
Description (not set)
Content-Length 3,618 bytes

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

Last SSL certificate

No certificate data available for this domain.

DNS history

IPv4 address Last updated
16.15.161.7 10/1/2026
16.15.183.128 10/1/2026
16.15.212.237 10/1/2026
16.15.214.118 10/1/2026
16.15.245.127 10/1/2026
Name server Last updated
ns-1035.awsdns-01.org 12/6/2023
ns-165.awsdns-20.com 12/6/2023
ns-1959.awsdns-52.co.uk 12/6/2023
ns-792.awsdns-35.net 12/6/2023

Last 5 redirect domains

Domain Last seen
flat221b.net 1/29/2025
flat221b.org 1/29/2025

Reverse IP neighbours

16.15.244.139 236 domains · here since 9/29/2026
Domain On this IP since
zurawell.com 9/30/2026
yuyangchang.com 10/2/2026
yesstaffing.org 9/29/2026
wholesalescreeningsolutions.net 9/23/2026
whereistandsong.org 10/2/2026
warmth4rimarketplace.com 10/3/2026
wageup.ai 9/29/2026
vipvrapp.com 10/1/2026
videomessage.co 9/23/2026
victoryfunds.us 9/28/2026
viafora.com 10/1/2026
vendassimples.com.br 9/29/2026
and 223 more
16.15.207.181 208 domains · here since 9/29/2026
Domain On this IP since
zoomcyclestudios.com 10/1/2026
wyzardhq.com 9/23/2026
winky.ca 9/26/2026
wiannobridgefestival.com 9/22/2026
whyibought.com 9/28/2026
war-against-hope.com 9/23/2026
walexglobal.com 10/2/2026
vsevd.com.br 9/24/2026
voluumtrk2.com 9/22/2026
vicodinaddictionrehab.co 9/29/2026
vice.graphics 9/26/2026
venetianpool.info 9/24/2026
and 195 more
16.15.212.122 197 domains · here since 9/29/2026
Domain On this IP since
zoomingventures.com 10/1/2026
zonallaves.com 9/28/2026
yutzy.net 9/23/2026
yourhomechurch.tv 9/23/2026
xsolis.mobi 10/1/2026
woopsor.com 9/24/2026
wepresenting.com 9/28/2026
webstack.cl 10/1/2026
warrantied.au 9/28/2026
videotranscoding.com 9/25/2026
videnton.net 9/23/2026
vf1ward.org 9/30/2026
and 184 more
16.182.36.229 25 domains · here since 9/29/2026
Domain On this IP since
vdjpro.com 9/26/2026
upgraderacing.co.nz 9/30/2026
unstuck.com 9/29/2026
tennisgraph.com 9/27/2026
simonsinsite.com 10/3/2026
riipenaccess.io 9/23/2026
pilotcoresystems.com 9/23/2026
packagingprice.org 9/26/2026
nailsbytak.com 9/29/2026
matthewdodds.com 10/2/2026
lilcoconuts.com 9/30/2026
keepesfh.com 10/1/2026
and 12 more
52.216.48.13 23 domains · here since 9/29/2026
Domain On this IP since
wutsi.com 10/1/2026
unfortunateportrait.net 10/2/2026
tmi-honeysblog.com 10/2/2026
thehollywood411.com 9/28/2026
techlawyers.org 9/29/2026
safething.fr 9/30/2026
promomaletas.com 9/22/2026
paygables.biz 9/28/2026
negociosleonisa.com 9/25/2026
juancarlos.cc 9/12/2026
johnmdelgado.com 9/30/2026
dyindude.net 9/23/2026
and 10 more
52.217.201.29 21 domains · here since 9/29/2026
Domain On this IP since
wecreativeco.com 10/1/2026
samsungdss.com 9/30/2026
salvationnation.us 10/2/2026
ranktherumble.com 9/28/2026
prettec.inf.br 9/28/2026
noladrains.com 9/29/2026
mygreenbutton.ca 9/29/2026
learnevolve.com 9/28/2026
ijustwantthepaper.com 9/25/2026
homecoinvesting.org 10/1/2026
greatbraingain.com 9/22/2026
giffen.us 10/1/2026
and 8 more
52.216.211.149 17 domains · here since 9/29/2026
Domain On this IP since
whitesandspi.com 10/1/2026
ultimate-lesson.com 10/2/2026
tutorvw.com 9/28/2026
triaddealer.net 10/1/2026
swimnyc.org 9/23/2026
sleitnick.com 10/2/2026
rheemdisasterrelief.com 9/22/2026
oauth2.io 10/2/2026
lebwebsolutions.com 10/2/2026
krantzselectwoods.com 10/2/2026
intellitechinnovations.net 9/24/2026
goki.me 9/30/2026
and 4 more
52.216.27.107 11 domains · here since 9/29/2026
Domain On this IP since
wander-ment.com 10/1/2026
savetherace.com 9/26/2026
q2aviation.com 9/21/2026
powergenmarketplace.com 9/22/2026
ohnocafe.com 9/22/2026
guesttix.net 9/27/2026
gsocmsam.org 9/28/2026
ghzzaal.me 9/24/2026
clarkdm61.com 9/29/2026
brainhealthweek.net 9/27/2026

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.