21sci-tech.com 21st Century Home Page

21sci-tech.com Overview

21sci-tech.com belongs to NETWORK-SOLUTIONS-HOSTING - Network Solutions, LLC, US. Check the list of other websites hosted by NETWORK-SOLUTIONS-HOSTING - Network Solutions, LLC, US.

In terms of rank-to-traffic ratio, 21sci-tech.com has 1,580 unique users per day, viewing 3,192 pages. The rank based value of 21sci-tech.com is 2,333 USD. Every user makes 2.16 pageviews on average.

21sci-tech.com boasts a link base consisting of 212 referring domains and 267 external backlinks, as revealed by the data obtained from web network scanning.

21sci-tech.com top-level domain belongs to .COM domain zone. Check other webpages in .COM zone.

According the last verification test in October 17, 2022, 21sci-tech.com has an expired SSL certificate issued by Let's Encrypt (expired on January 01, 2023). Click button “Update” SSL Information at the Safety Information section. Check the list of websites using SSL by Let's Encrypt.

Based on data from Google Safe Browsing and Symantec 21sci-tech.com is a fairly safe domain.

Based on Mobile-Friendly test by Google 21sci-tech.com is poorly optimized for mobile phones and tablets. Remember that optimizing your website design for mobile devices ensures that all of your web pages perform well on all devices, page loading speed can also be accelerated.

21sci-tech.com Website Safety

Overview

Last Updated: 11/27/2024

Unknown status.

We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Last Updated: 04/14/2024

21sci-tech.com is safe.

Norton ConnectSafe evaluates 21sci-tech.com for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 11/27/2024

Not yet checked.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 01/11/2019

21sci-tech.com is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.

Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.

Site Advisor

Last Updated: 04/26/2021

21sci-tech.com is safe.

McAfee assesses 21sci-tech.com for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze 21sci-tech.com for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 11/27/2024

21sci-tech.com child safety is unknown.

The WOT calculates reputation of the 21sci-tech.com. This reputation system receives ratings from users and information from third-party sources, assesses the 21sci-tech.com for safety features and confirms, whether 21sci-tech.com is suitable for children.

SSL Information

SSL Checker Tool

Domain	21sci-tech.com
Issuer Organization	Let's Encrypt
Issuer	R3
Algorithm	RSA-SHA256
Valid form	10/03/2022
Expiration	01/01/2023
Signed	Certificate is not self signed
Additional Domains	*.21sci-tech.com 21sci-tech.21stcenturysciencetech.com 21sci-tech.com www.21sci-tech.21stcenturysciencetech.com

21sci-tech.com Rank History

Alexa Rank shows how popular 21sci-tech.com is in comparison with other sites. The most popular site has Alexa Rank equals 1. If 21sci-tech.com has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to 21sci-tech.com and pageviews on 21sci-tech.com over the past 3 months.

21sci-tech.com Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 19871

ASN Title: NETWORK-SOLUTIONS-HOSTING - Network Solutions, LLC, US

Last Update: 07/18/2024

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 19871
ASName: NETWORK-SOLUTIONS-HOSTING
ASHandle: AS19871
RegDate: 2006-09-06
Updated: 2012-03-02
Ref: https://rdap.arin.net/registry/autnum/19871

OrgName: Network Solutions, LLC
OrgId: NETWO-59
Address: 12808 Gran Bay Parkway West
City: Jacksonville
StateProv: FL
PostalCode: 32258
Country: US
RegDate: 2004-08-05
Updated: 2017-01-28
Ref: https://rdap.arin.net/registry/entity/NETWO-59

OrgAbuseHandle: NOC2042-ARIN
OrgAbuseName: NOC
OrgAbusePhone: +1-703-668-4900
OrgAbuseEmail: nocsupport@networksolutions.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/NOC2042-ARIN

OrgTechHandle: NOC2042-ARIN
OrgTechName: NOC
OrgTechPhone: +1-703-668-4900
OrgTechEmail: nocsupport@networksolutions.com
OrgTechRef: https://rdap.arin.net/registry/entity/NOC2042-ARIN

RTechHandle: NOC2042-ARIN
RTechName: NOC
RTechPhone: +1-703-668-4900
RTechEmail: nocsupport@networksolutions.com
RTechRef: https://rdap.arin.net/registry/entity/NOC2042-ARIN

RNOCHandle: NOC2042-ARIN
RNOCName: NOC
RNOCPhone: +1-703-668-4900
RNOCEmail: nocsupport@networksolutions.com
RNOCRef: https://rdap.arin.net/registry/entity/NOC2042-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

21sci-tech.com Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: 21SCI-TECH.COM
Registry Domain ID: 2161177240_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com
Updated Date: 2022-10-05T06:37:17Z
Creation Date: 2017-09-09T14:12:22Z
Registry Expiry Date: 2027-09-09T14:12:22Z
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: abuse@godaddy.com
Registrar Abuse Contact Phone: 480-624-2505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: CNS283.HOSTGATOR.COM
Name Server: CNS284.HOSTGATOR.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2023-11-24T23:14:50Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL

Host	MX Record	Priority	TTL

Host	NS Record	TTL

Host	TXT Record	TTL

21sci-tech.com HTML Check

HTML Validation Tool

Errors

Almost standards mode doctype. Expected “<!DOCTYPE html>”.

Attribute “height” not allowed on element “table” at this point.

Attribute “bordercolor” not allowed on element “table” at this point.

The “width” attribute on the “table” element is obsolete. Use CSS instead.

The “align” attribute on the “table” element is obsolete. Use CSS instead.

The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.

The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.

The “bgcolor” attribute on the “table” element is obsolete. Use CSS instead.

The “border” attribute on the “table” element is obsolete. Use CSS instead.

Attribute “bordercolor” not allowed on element “tr” at this point.

The “valign” attribute on the “tr” element is obsolete. Use CSS instead.

Attribute “bordercolor” not allowed on element “td” at this point.

The “height” attribute on the “td” element is obsolete. Use CSS instead.

The “bgcolor” attribute on the “td” element is obsolete. Use CSS instead.

The “align” attribute on the “div” element is obsolete. Use CSS instead.

The “align” attribute on the “img” element is obsolete. Use CSS instead.

The “bgcolor” attribute on the “tr” element is obsolete. Use CSS instead.

The “align” attribute on the “td” element is obsolete. Use CSS instead.

The “valign” attribute on the “td” element is obsolete. Use CSS instead.

Attribute “background” not allowed on element “tr” at this point.

The “align” attribute on the “th” element is obsolete. Use CSS instead.

Attribute “bordercolor” not allowed on element “th” at this point.

The “width” attribute on the “td” element is obsolete. Use CSS instead.

The “height” attribute on the “th” element is obsolete. Use CSS instead.

The “valign” attribute on the “th” element is obsolete. Use CSS instead.

The “width” attribute on the “th” element is obsolete. Use CSS instead.

The “font” element is obsolete. Use CSS instead.

The “hspace” attribute on the “img” element is obsolete. Use CSS instead.

The “vspace” attribute on the “img” element is obsolete. Use CSS instead.

The “align” attribute on the “p” element is obsolete. Use CSS instead.

Bad value “home page art/econDevel.gif” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.

Bad value “home page art/SciClassics.gif” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.

Bad value “highlights/Spring_Summ_06 .html” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Stray end tag “font”.

The “align” attribute on the “h4” element is obsolete. Use CSS instead.

The “align” attribute on the “h5” element is obsolete. Use CSS instead.

Stray end tag “span”.

Stray end tag “a”.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Bad value “Articles 2005/Archimedean_Polyhedra.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Bad value “Articles 2005/Cholesterol_Scam.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Bad value “Articles 2005/Cholesterol_not_health_marker.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Bad value “Articles 2005/Thorium_nuclear.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Bad value “Articles 2005/ComingPresentIceAge.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Bad value “Articles 2008/papin_steam_engine.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.

Warnings

The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.

This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.

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21sci-tech.com 21st Century Home Page

21sci-tech.com Overview

21sci-tech.com Website Safety

21sci-tech.com Rank History

21sci-tech.com Hosting Information

21sci-tech.com Domain Registration and Settings

21sci-tech.com HTML Check

21sci-tech.com Similar Audits

21sci-tech.com Common Typos