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83
Total
80
DNS
90
Email
77
Security
55
Network
100
Availability
Domaincas.cn
IPv41
IPv61
MX records1
StatusActive
Domain technical report

中国科学院

cas.cn

Generated: 2026-08-09T00:02:30-05:00 · Cached result

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IPv41
IPv61
MX1
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

1 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

2 NS record(s); 2 or more required.

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

!
DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

!
CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

1 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

✓
DMARC25 / 25 pts · Mail

DMARC policy published.

✓
DKIM20 / 20 pts · Mail

A DKIM selector was verified.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

131 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers12 / 35 pts · Security

3 of 9 evaluated headers detected.

!
PTR reverse DNS0 / 30 pts · Network

PTR not detected.

i
IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓
IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓
HTTP response40 / 40 pts · Availability

HTTP/1.1 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
159.226.242.61

AAAA

1 record(s)
2400:dd01:1017:1000::9fe2:f23d

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
5 mx.cstnet.cn.

TXT

1 record(s)
"v=spf1 include:spf.mail.cstnet.cn -all"

NS

2 record(s)
ns3.cstnet.cn.
ns4.cstnet.cn.

SOA

1 record(s)
ns1.cdns.cn. mail.cnnic.cn. 4637 3600 600 2419200 800

CAA

0 record(s)
—

Not configured

DS

0 record(s)
—

Not configured

DNSKEY

0 record(s)
—

Not configured

RRSIG

0 record(s)
—

Not configured

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 include:spf.mail.cstnet.cn -all

DMARC

Configured
v=DMARC1; p=quarantine; rua=mailto:dmarc-report@cstnet.cn; ruf=mailto:dmarc-report@cstnet.cn

DKIM

Selector dkim
k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCd94LVWb/pPHnMd67fRCTNwyfa4XOMeoWZgZo56zMi1cXrxRxg23Mx1hnlDfTrnAKrYvnLPzmnpPsy18d9T4PpFXvR3QD4tBlQMIUt50t2UCcPzJTgbcmnaK1u6MtR67iFqyxqAwGWk/WFHPBRTz8NVer+8//ChUnDW0mMf3eQBwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
中国科学院
Description
Final URL
https://www.cas.cn/
HTTP status
200

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://www.cas.cn/
Version
2
Server
Microsoft-IIS/7.5
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
China Financial Certification Authority
CN
*.cas.cn
Valid from
2025-11-20T01:14:27-06:00
Valid until
2026-12-18T03:19:40-06:00
Days remaining
131
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

3 active
—
HSTSNot detected
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
—
Referrer PolicyNot detected
—
Permissions PolicyNot detected
—
Cross-Origin-Opener-PolicyNot detected
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
159.226.242.61
283,21 ms
Cloudflare
1.1.1.1
159.226.242.61
482,16 ms
Quad9
9.9.9.9
159.226.242.61
232,78 ms
OpenDNS
208.67.222.222
159.226.242.61
445,54 ms
AdGuard
94.140.14.14
159.226.242.61
516,67 ms

IP, geolocation and ASNAssociated network information

159.226.242.61

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

mx.cstnet.cn

Port 25: Closed/unreachable - 224.1 ms - 
Port 465: Closed/unreachable - 4232 ms - 
Port 587: Closed/unreachable - 4014.4 ms -

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