How is zhihu.com?

Looks fine risk 0/100

Registered 19 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 1909 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

200

1909 ms · ends at www.zhihu.com

HTTPS

42 d

left on a DigiCert, Inc. certificate

Age

19 years

registered 2007-06-15

Blocklists

listings across 5 lists

Everything we looked at

DNS records4 record types

A	43.135.83.2
MX	5 mxbiz1.qq.com 10 mxbiz2.qq.com
NS	ns4.dnsv5.com ns3.dnsv5.com
TXT	apple-domain-verification=0ABf57rqECBcCKb6 m5g7qjk31l5d1hkq6m3zvcf6lg2f0h16 google-site-verification=WreyhhjBpv_EcWw27fGRsO7yz4sy_6oiT1HeoJfv1JQ 3nsr8c3w7yg4bngn0z53wr22hm54s5q2 v=spf1 include:spf.mail.qq.com -all

RegistrationDNSPod, Inc.

registrar	DNSPod, Inc.
registered	2007-06-15
expires	2029-09-29
last changed	2022-04-18
owner	Redacted for Privacy
nameservers	ns3.dnsv5.com ns4.dnsv5.com
status	client transfer prohibited client update prohibited

registered 2007-06-15expires 2029-09-29

HTTPS certificate42 days left

valid	yes
issuer	DigiCert, Inc.
covers	*.zhihu.com, zhihu.com
protocol	TLSv1.2

issued 2025-12-11expires 2026-12-10

DNSSECinsecure

Domain is not signed with DNSSEC

. → com → zhihu.com

Email authenticationexcellent

SPF	pass `v=spf1 include:spf.mail.qq.com -all`
DMARC	pass policy quarantine
DKIM	found: google, mail

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 150/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

30/45missing: CAA Records, DKIM Presence

Advanced Security

15/25missing: SOA Record Configuration, IPv6 Support

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 5 lookups

SURBL MultidomainURIBL MultidomainSpamCop43.135.83.2Barracuda43.135.83.2UCEPROTECT Level 143.135.83.2

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=zhihu.com" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=zhihu.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on zhihu.com. Reference: /llms.txt.

Watch zhihu.com. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days