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Total

DNS

Email

Security

Network

100

Availability

Domaindocin.com

IPv41

IPv60

MX records5

StatusActive

Domain technical report

Docin.com豆丁网-分享文档发现价值

docin.com

豆丁网是面向全球的中文社会化阅读分享平台，拥有商业,教育,研究报告,行业资料,学术论文,认证考试,星座,心理学等数亿实用文档和书刊杂志。

Generated: 2026-08-10T13:39:04-05:00 · Cached result

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IPv41

IPv60

MX5

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 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

5 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

157 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers12 / 35 pts · Security

3 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

IPv4 diversity20 / 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/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)

221.122.132.138

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

5 aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
5 aspmx2.googlemail.com.
5 aspmx3.googlemail.com.

TXT

2 record(s)

"google-site-verification=-kA59AYYOrPHHDI79ysvqxz3nr39gFwFhcoOMIYcvuA"
"v=spf1 redirect=_spf.mailhostbox.com"

NS

2 record(s)

ns12.xincache.com.
ns11.xincache.com.

SOA

1 record(s)

ns11.xincache.com. ns12.xincache.com. 1782802180 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.docin.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 redirect=_spf.mailhostbox.com

DMARC

Not configured

—

Not configured

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Docin.com豆丁网-分享文档发现价值

Description

豆丁网是面向全球的中文社会化阅读分享平台，拥有商业,教育,研究报告,行业资料,学术论文,认证考试,星座,心理学等数亿实用文档和书刊杂志。

Final URL

https://www.docin.com/

HTTP status

200

HTTP

Status

HTTP/1.1 200 OK

Final URL

https://www.docin.com/

Version

Server

nginx

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Zhejiang Huluwa Digital Certification Co., Ltd.

*.docin.com

Valid from

2026-01-13T18:00:00-06:00

Valid until

2027-01-14T17:59:59-06:00

Days remaining

157

Protocol

TLSv1.2

Cipher

ECDHE-RSA-AES128-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

221.122.132.138

275,43 ms

Cloudflare

1.1.1.1

221.122.132.138

231,08 ms

Quad9

9.9.9.9

221.122.132.138

256,46 ms

OpenDNS

208.67.222.222

221.122.132.138

298,99 ms

AdGuard

94.140.14.14

221.122.132.138

318,20 ms

IP, geolocation and ASNAssociated network information

221.122.132.138

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

aspmx.l.google.com

Port 25: Closed/unreachable - 22.3 ms - 220 mx.google.com ESMTP 586e51a60fabf-459f3488e70si8902689fac.143 - gsmtp
Port 465: Closed/unreachable - 4021.3 ms - 
Port 587: Closed/unreachable - 4019.4 ms -

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Docin.com豆丁网-分享文档 发现价值

DiagnosticsMain findings and recommendations

DNS and emailPublished records and email configuration

A

AAAA

CNAME

MX

TXT

NS

SOA

CAA

DS

DNSKEY

RRSIG

NSEC

NSEC3

SRV

NAPTR

TLSA

SSHFP

SPF

DMARC

DKIM

Analyzed webpageMetadata and HTTP response

Title and description

HTTP

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Security headers

DNS propagationComparison across public resolvers

Public resolver comparison

IP, geolocation and ASNAssociated network information

221.122.132.138

Visitor information

SMTPEmail port connectivity

aspmx.l.google.com

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Docin.com豆丁网-分享文档发现价值