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Total

DNS

Email

Security

Network

100

Availability

Domaindouban.com

IPv43

IPv60

MX records3

StatusActive

Domain technical report

豆瓣

douban.com

提供图书、电影、音乐唱片的推荐、评论和价格比较，以及城市独特的文化生活。

Generated: 2026-08-08T19:43:16-05:00 · Cached result

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IPv43

IPv60

MX3

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

3 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 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

3 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

DMARC0 / 25 pts · Mail

DMARC policy not found.

DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

77 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓

IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

IPv6 connectivity0 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓

HTTP response40 / 40 pts · Availability

HTTP/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

3 record(s)

120.53.130.158
140.143.177.206
81.70.124.99

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

3 record(s)

30 mx3.feishu.cn.
10 mx1.feishu.cn.
20 mx2.feishu.cn.

TXT

2 record(s)

"_7taq71qhdd4d8aex977o81h07frjhgl"
"v=spf1 include:feishu-spf.mail.douban.com ~all"

NS

2 record(s)

ns4.dnsv4.com.
ns3.dnsv4.com.

SOA

1 record(s)

ns3.dnsv4.com. enterprise2dnsadmin.dnspod.com. 1784513585 3600 180 1209600 180

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

1 record(s)

\000.douban.com. A NS SOA MX TXT AAAA SRV RRSIG NSEC DNSKEY SVCB HTTPS CAA

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:feishu-spf.mail.douban.com ~all

DMARC

Not configured

—

Not configured

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

豆瓣

Description

提供图书、电影、音乐唱片的推荐、评论和价格比较，以及城市独特的文化生活。

Final URL

https://www.douban.com/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://www.douban.com/

Version

Server

dae

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

douban.com

Valid from

2026-07-26T22:49:50-05:00

Valid until

2026-10-24T22:49:49-05:00

Days remaining

Protocol

TLSv1.2

Cipher

ECDHE-RSA-AES128-GCM-SHA256

Security headers

2 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

✓

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

120.53.130.158, 140.143.177.206, 81.70.124.99

82,66 ms

Cloudflare

1.1.1.1

120.53.130.158, 140.143.177.206, 81.70.124.99

71,61 ms

Quad9

9.9.9.9

120.53.130.158, 140.143.177.206, 81.70.124.99

83,55 ms

OpenDNS

208.67.222.222

120.53.130.158, 140.143.177.206, 81.70.124.99

385,04 ms

AdGuard

94.140.14.14

120.53.130.158, 140.143.177.206, 81.70.124.99

64,17 ms

IP, geolocation and ASNAssociated network information

120.53.130.158

No data

success

country

region

city

asn

organization

isp

140.143.177.206

No data

success

country

region

city

asn

organization

isp

81.70.124.99

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

mx3.feishu.cn

Port 25: Closed/unreachable - 22.4 ms - 
Port 465: Closed/unreachable - 4030.6 ms - 
Port 587: Closed/unreachable - 4043.2 ms -

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