Las.ac.cn 中国科学院知识服务平台

Las.ac.cn Overview

out of 100

Optimization 76 out of 100

Las.ac.cn is the official website of the National Science Library (NSL) at the Chinese Academy of Sciences, a prestigious scientific research institution in China. The website presents a comprehensive digital science information service environment for researchers, students, and the public. The main focus of the website is to provide access to various scientific databases and resources, including A&I database, full-text database, citation database, among others.

The website follows a three-layer structure that includes the portal, application, and resource layers. The portal layer enables users to customize their information and services, while the application layer offers services like OpenURL linking server, Cross-Database Meta-search engine, and OAI Service providers that combine various resources into a universal knowledge platform. The resource layer comprises the databases, which contain the actual information and data.

The site seems family-friendly, as it aims to provide scientific knowledge to researchers, students, and the public. However, given the technical nature of its content, the site may be more relevant to older children or adults who have an interest in scientific research and development.

The website has a reasonably high traffic rate, with 2008 unique users and 9437.6 page views daily. Additionally, the site's domain is .CN, which indicates that it is hosted in China. The website is hosted by CSTNET-AS-AP Computer Network Information Center, CN hosting.

The PageSpeed Insights scores suggest that the website's speed is suboptimal, with a score of 40 out of 100, but the optimization score is relatively good at 76 out of 100. This score indicates that the website is well optimized, but it may require more server capacity to perform well.

Overall, las.ac.cn is a highly informative and user-friendly website for anyone interested in scientific research and development, specifically Chinese or Asian scholars. It provides a wealth of resources and databases that are accessible to users through a sophisticated and well-organized framework. Nonetheless, due to the technical nature of the content, it may not be the most suitable website for casual readers or young children.

Las.ac.cn Rank Summary

Global Rank

69,228

Average Load Time

1.18sec

Links In Count

615

Website Value

$166,440

Audience Geography. Where are las.ac.cn visitors located?

Country	Visitors
China CN	98%
Other	2%

Country	Pageviews
China CN	99.4%
Other	0.6%

Country	Rank
China CN	7793

Where do visitors go on las.ac.cn?

Subdomain	Pageviews
las.ac.cn	52.67%
dpaper.las.ac.cn	16.05%
opac.las.ac.cn	7.26%
other	24.02%

Subdomain	Pageviews per User
dpaper.las.ac.cn	6
las.ac.cn	4.1
opac.las.ac.cn	2

Subdomain	Reach
las.ac.cn	60.8%
opac.las.ac.cn	16.88%
dpaper.las.ac.cn	11.87%

How popular is las.ac.cn?

Period	Global Rank	Global Rank Delta
past 3 months	69228	27747
past month	68970	4906
past week	53285	-39049
yesterday	1277472	1189120

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	55899	22880	11	-46.71%	4.7	-3.12%
30	55361	-124	11	-0.18%	4.7	10%
7	37623	-48773	18	200%	6	60%
1	1365183	1270482	1	-99.121%	1	-66.667%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	80160	31894	87	-44.98%
30	80119	7717	87	-10.73%
7	65080	-37749	11	70%
1	1229435	1138062	2	-97.362%

Las.ac.cn Website Safety

Overview

Last Updated: 12/25/2024

Overall result - las.ac.cn is safe.

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: 03/22/2024

las.ac.cn is safe.

Norton ConnectSafe evaluates las.ac.cn for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 10/19/2016

las.ac.cn is safe.

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: 01/09/2019

las.ac.cn 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: 02/23/2021

las.ac.cn is safe.

McAfee assesses las.ac.cn 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 las.ac.cn for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 12/25/2024

las.ac.cn child safety is unknown.

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

SSL Information

SSL Checker Tool

Domain	*.las.ac.cn
Issuer Organization	China Financial Certification Authority
Issuer	CFCA OV OCA
Algorithm	RSA-SHA256
Valid form	04/03/2024
Expiration	04/03/2025
Signed	Certificate is not self signed
Additional Domains	*.las.ac.cn las.ac.cn

Las.ac.cn Rank History

Alexa Rank shows how popular las.ac.cn is in comparison with other sites. The most popular site has Alexa Rank equals 1. If las.ac.cn 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 las.ac.cn and pageviews on las.ac.cn over the past 3 months.

Las.ac.cn Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 7497

ASN Title: CSTNET-AS-AP Computer Network Information Center, CN

Last Update: 07/18/2024

% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS7467 - AS7722'

as-block: AS7467 - AS7722
descr: APNIC ASN block
remarks: These AS numbers are further assigned by APNIC
remarks: to APNIC members and end-users in the APNIC region
admin-c: HM20-AP
tech-c: HM20-AP
mnt-by: APNIC-HM
mnt-lower: APNIC-HM
last-modified: 2008-09-04T06:40:26Z
source: APNIC

role: APNIC Hostmaster
address: 6 Cordelia Street
address: South Brisbane
address: QLD 4101
country: AU
phone: +61 7 3858 3100
fax-no: +61 7 3858 3199
e-mail: helpdesk@apnic.net
admin-c: AMS11-AP
tech-c: AH256-AP
nic-hdl: HM20-AP
remarks: Administrator for APNIC
notify: hostmaster@apnic.net
mnt-by: MAINT-APNIC-AP
last-modified: 2013-10-23T04:06:51Z
source: APNIC

% Information related to 'AS7497'

% Abuse contact for 'AS7497' is 'ipas@cnnic.cn'

aut-num: AS7497
as-name: CSTNET-AS-AP
descr: Computer Network Information Center
descr: Chinese Academy of Science
descr: 4,4th South Street,Zhongguancun,Haidian District,Beijing, China ,P.O. Box 349 (100190)
country: CN
import: from AS4538 accept
import: from AS4789 accept
import: from AS4837 accept
import: from AS4847 accept
import: from AS9306 accept
import: from AS9389 accept
import: from AS9394 accept
import: from AS9406 accept
import: from AS9800 accept
import: from AS9808 accept
import: from AS3320 accept ANY
import: from AS3491 accept ANY
import: from AS6453 accept ANY
import: from AS10026 accept ANY
import: from AS7497:AS-CUSTOMERS accept
export: to AS4538 announce
export: to AS4789 announce
export: to AS4837 announce
export: to AS4847 announce
export: to AS9306 announce
export: to AS9389 announce
export: to AS9394 announce
export: to AS9406 announce
export: to AS9800 announce
export: to AS9808 announce
export: to AS3320 announce
export: to AS3491 announce
export: to AS6453 announce
export: to AS10026 announce
export: to AS7497:AS-CUSTOMERS announce ANY
export: to AS3320 announce
export: to AS3491 announce
export: to AS6453 announce
export: to AS10026 announce
admin-c: LH90-AP
tech-c: LH90-AP
mnt-lower: MAINT-CN-LIHONG
mnt-routes: MAINT-CN-CSTNET
mnt-by: MAINT-CN-CSTNET
mnt-irt: IRT-CNNIC-CN
last-modified: 2015-12-01T22:13:14Z
source: APNIC

irt: IRT-CNNIC-CN
address: Beijing, China
e-mail: ipas@cnnic.cn
abuse-mailbox: ipas@cnnic.cn
admin-c: IP50-AP
tech-c: IP50-AP
auth: # Filtered
remarks: Please note that CNNIC is not an ISP and is not
remarks: empowered to investigate complaints of network abuse.
remarks: Please contact the tech-c or admin-c of the network.
mnt-by: MAINT-CNNIC-AP
last-modified: 2017-11-01T08:57:39Z
source: APNIC

person: Li Hong
nic-hdl: LH90-AP
e-mail: lihong@cstnet.net.cn
address: No.4, Zhongguancun 4th South Street, Haidian District, Beijing
phone: +86-10-58812000
fax-no: +86-10-58812900
country: CN
mnt-by: MAINT-CN-LIHONG
last-modified: 2008-09-04T07:29:19Z
source: APNIC

% This query was served by the APNIC Whois Service version 1.88.15-46 (WHOIS-US3)

Las.ac.cn Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: las.ac.cn
ROID: 20021209s10071s00000955-cn
Domain Status: ok
Registrant: 中国科学院文献情报中心
Registrant Contact Email: liush@mail.las.ac.cn
Sponsoring Registrar: 北京国科云计算技术有限公司（原北京中科三方网络技术有限公司）
Name Server: gate.las.ac.cn
Name Server: bib10.las.ac.cn
Registration Time: 1997-01-05 00:00:00
Expiration Time: 2028-07-01 00:00:00
DNSSEC: unsigned

DNS Records

DNS Lookup Tool

Host	A Record	TTL
las.ac.cn	124.16.154.233	3600

Host	MX Record	Priority	TTL
las.ac.cn	mail.las.ac.cn	10	3600

Host	NS Record	TTL
las.ac.cn	dns1.csdl.net.cn	3600
las.ac.cn	gate.las.ac.cn	3600
las.ac.cn	bib10.las.ac.cn	3600

Host	TXT Record	TTL
las.ac.cn	LiYu	3600

bib10.las.ac.cn
TTL: 3600
Email address: master.bib10.las.ac.cn
Serial: 2014011265
Refresh: 3600
Retry: 300
Expire: 2419200
Minimum: 14400

Las.ac.cn HTML Check

HTML Validation Tool

Errors

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

CSS: “bgcolor”: Property “bgcolor” doesn't exist.

No space between attributes.

Start tag “body” seen but an element of the same type was already open.

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

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

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

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

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

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

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

Stray start tag “table”.

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

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

Element “iframe” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)

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

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

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

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

Too many messages.

Warnings

The “type” attribute is unnecessary for JavaScript resources.

The “language” attribute on the “script” element is obsolete. You can safely omit it.

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

Las.ac.cn Desktop Performance

Last tested: 12/11/2019

Desktop Speed

34%

Enable compression

Optimize images

Leverage browser caching

Minify JavaScript

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Reduce server response time

Minify HTML

Prioritize visible content

Minify CSS

Desktop Resource Breakdown

Total Resources	63
Number of Hosts	4
Static Resources	54
JavaScript Resources	17
CSS Resources	6

Las.ac.cn Mobile Insights

Last tested: 05/21/2017

Mobile Usability

100%

Mobile Speed

40%

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Enable compression

Avoid landing page redirects

Leverage browser caching

Prioritize visible content

Minify CSS

Optimize images

Minify HTML

Minify JavaScript

Mobile Resource Breakdown

Total Resources	29
Number of Hosts	5
Static Resources	21
JavaScript Resources	5
CSS Resources	3

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Las.ac.cn 中国科学院知识服务平台

Las.ac.cn Overview

Las.ac.cn Rank Summary

Las.ac.cn Website Safety

Las.ac.cn Rank History

Las.ac.cn Hosting Information

Las.ac.cn Domain Registration and Settings

Las.ac.cn HTML Check

Las.ac.cn Desktop Performance

Las.ac.cn Mobile Insights

Las.ac.cn Similar Audits

Las.ac.cn Common Typos