HOW.IS
?

How is claude.ai?

Looks fine risk 0/100

Registered 8 years ago, on no blocklists we checked, valid HTTPS, the site answered 403 in 53 ms.

Why

02050100
finecarefulhigh risk
  • ·Nothing in the checks added risk.

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

How claude.ai looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
403
53 ms
HTTPS
43 d
left on a Let's Encrypt certificate
Age
8 years
registered 2018-08-04
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records5 record types
A160.79.104.10
AAAA2607:6bc0::10
NSisla.ns.cloudflare.com
randy.ns.cloudflare.com
TXT_4h91g65hky8g6rbfx22rpfu4pprn1v3
google-site-verification=vd3zHrSm-qrk36v4haRXBGrfAOM-O8b8pDiaPdI_s9Q
v=spf1 -all
google-site-verification=NISbSmcIQumvbPjLbYAhRmzrx1LSAhRMH6XVaKTWxe0
google-site-verification=iDyYpE6uHVggWrWzK-MEosRSp7XUE7wqBLGX0Ua71Pc
google-site-verification=YPYhXirYOvYGGQtAypqom1k-1KMXKHeWbxKgw60bDfo
CAA{'type': 'CAA', 'critical': 0, 'issuewild': 'letsencrypt.org'}
{'type': 'CAA', 'issue': 'pki.goog; cansignhttpexchanges=yes', 'critical': 0}
{'type': 'CAA', 'critical': 0, 'issuewild': 'amazon.com'}
{'type': 'CAA', 'issue': 'comodoca.com', 'critical': 0}
{'type': 'CAA', 'issue': 'digicert.com; cansignhttpexchanges=yes', 'critical': 0}
{'type': 'CAA', 'issue': 'amazonaws.com', 'critical': 0}
{'type': 'CAA', 'critical': 0, 'issuewild': 'digicert.com; cansignhttpexchanges=yes'}
{'type': 'CAA', 'critical': 0, 'issuewild': 'comodoca.com'}
{'type': 'CAA', 'critical': 0, 'issuewild': 'amazonaws.com'}
{'type': 'CAA', 'issue': 'amazon.com', 'critical': 0}
{'type': 'CAA', 'issue': 'ssl.com', 'critical': 0}
{'type': 'CAA', 'critical': 0, 'issuewild': 'amazontrust.com'}
{'type': 'CAA', 'critical': 0, 'issuewild': 'pki.goog; cansignhttpexchanges=yes'}
{'type': 'CAA', 'issue': 'amazontrust.com', 'critical': 0}
{'type': 'CAA', 'critical': 0, 'issuewild': 'awstrust.com'}
{'type': 'CAA', 'critical': 0, 'issuewild': 'ssl.com'}
{'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0}
{'type': 'CAA', 'issue': 'awstrust.com', 'critical': 0}
RegistrationMarkMonitor Inc.
registrarMarkMonitor Inc.
registered2018-08-04
expires2029-08-04
last changed2026-08-12
ownerAnthropic PBC
nameserversisla.ns.cloudflare.com
randy.ns.cloudflare.com
statusclient delete prohibited
client transfer prohibited
client update prohibited
registered 2018-08-04expires 2029-08-04
HTTPS certificate43 days left
validyes
issuerLet's Encrypt
coversclaude.ai, staging.claude.ai, www.claude.ai
protocolTLSv1.3
issued 2026-09-10expires 2026-12-09
DNSSECinsecure

Domain is not signed with DNSSEC

. → ai → claude.ai
Email authenticationfair
SPFpass v=spf1 -all
DMARCpass policy reject
DKIMnone of 20 common selectors

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

Security scoregrade B · 165/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
45/45missing: DKIM Presence
Advanced Security
15/25missing: Mail Server Configuration
Domain Reputation
50/50
Threat Detection
45/45missing: Domain Age Check
Blocklists0 listings · 5 lookups
SURBL MultidomainURIBL MultidomainSpamCop160.79.104.10Barracuda160.79.104.10UCEPROTECT Level 1160.79.104.10

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=claude.ai" \ -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=claude.ai"

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

Watch claude.ai. 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