Domain technical report
zhihu.com
zhihu.com
IPv41
IPv60
MX2
NS2
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69
Total
70
DNS
90
Email
77
Security
20
Network
60
Availability
Domainzhihu.com
IPv41
IPv60
MX records2
StatusActive
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
2 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
124 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 response0 / 40 pts · Availability
HTTP/2 405
HTTPS final URL20 / 20 pts · Availability
Final URL uses HTTPS.
DNS and emailPublished records and email configuration
A
1 record(s)43.135.83.2
AAAA
0 record(s)—
Not configured
CNAME
0 record(s)—
Not configured
MX
2 record(s)10 mxbiz2.qq.com. 5 mxbiz1.qq.com.
TXT
5 record(s)"v=spf1 include:spf.mail.qq.com -all" "google-site-verification=WreyhhjBpv_EcWw27fGRsO7yz4sy_6oiT1HeoJfv1JQ" "apple-domain-verification=0ABf57rqECBcCKb6" "m5g7qjk31l5d1hkq6m3zvcf6lg2f0h16" "3nsr8c3w7yg4bngn0z53wr22hm54s5q2"
NS
2 record(s)ns3.dnsv5.com. ns4.dnsv5.com.
SOA
1 record(s)ns3.dnsv5.com. enterprise3dnsadmin.dnspod.com. 1783067233 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.zhihu.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
Configuredv=spf1 include:spf.mail.qq.com -all
DMARC
Configuredv=DMARC1; p=quarantine; rua=mailto:mailauth-reports@qq.com
DKIM
Selector googlev=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCNJ5EoOOUEgjEz91pw0U+xhwMiTpX5ngwvRPnJ7L6wfFeKH1RMiFeOb5ZOPLWKSGY5IRKtjjalATeHl8jWlVWe8O8qHHpl2yFfOG+Y8xq1K99LQyQQjqgZHzuSSH300DCHZvv+arAI3OYUhY8Z2da59ViMOblGJfT+oCz90WYVJQIDAQAB
Analyzed webpageMetadata and HTTP response
Title and description
ExtractedTitle
Description
Final URL
https://www.zhihu.com/
HTTP status
403
HTTP
Status
HTTP/2 405
Final URL
https://www.zhihu.com/
Version
3
Server
BLB/25.12.0.2
X-Powered-By
SSL and HTTP securityCertificate, protocol and security headers
SSL certificate
AvailableAvailable
Yes
Issuer
DigiCert, Inc.
CN
*.zhihu.com
Valid from
2025-12-10T18:00:00-06:00
Valid until
2026-12-10T17:59:59-06:00
Days remaining
124
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES128-GCM-SHA256
Security headers
3 activeHSTSNot detected
Content Security PolicyNot detected
X-Content-Type-OptionsImplemented
X-Frame-OptionsImplemented
Referrer PolicyImplemented
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
ConsistentConsistent propagation
5 public resolvers queried.
ResolverServerResultLatency
Google
8.8.8.843.135.83.2
81,40 ms
Cloudflare
1.1.1.143.135.83.2
233,91 ms
Quad9
9.9.9.943.135.83.2
87,65 ms
OpenDNS
208.67.222.22243.135.83.2
84,76 ms
AdGuard
94.140.14.1443.135.83.2
77,54 ms
IP, geolocation and ASNAssociated network information
43.135.83.2
No datasuccess
No
country
region
city
asn
organization
isp
Visitor information
Visitorip
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
mxbiz2.qq.com
Port 25: Closed/unreachable - 30.1 ms - Port 465: Closed/unreachable - 4049.3 ms - Port 587: Closed/unreachable - 4017.6 ms -