How is czbooks.net?

Looks fine risk 0/100

Registered 7 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 411 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

411 ms

HTTPS

47 d

left on a Google Trust Services certificate

Age

7 years

registered 2019-05-28

Blocklists

listings across 5 lists

Everything we looked at

DNS records3 record types

A	104.18.16.145 104.18.17.145
AAAA	2606:4700::6812:1091 2606:4700::6812:1191
NS	hank.ns.cloudflare.com emma.ns.cloudflare.com

RegistrationNameSilo, LLC

registrar	NameSilo, LLC
registered	2019-05-28
expires	2030-05-28
last changed	2025-03-06
owner	See PrivacyGuardian.org
nameservers	emma.ns.cloudflare.com hank.ns.cloudflare.com
status	client transfer prohibited

registered 2019-05-28expires 2030-05-28

HTTPS certificate47 days left

valid	yes
issuer	Google Trust Services
covers	czbooks.net, *.czbooks.net
protocol	TLSv1.3

issued 2026-09-17expires 2026-12-16

DNSSECinsecure

Domain is not signed with DNSSEC

. → net → czbooks.net

Email authenticationpoor

SPF	none
DMARC	none
DKIM	none of 1 common selectors

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

Security scoregrade C · 120/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

0/45missing: CAA Records, SPF Record, DMARC Record, DKIM Presence

Advanced Security

15/25missing: Mail Server Configuration

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 8 lookups

SURBL MultidomainURIBL MultidomainSpamCop104.18.17.145Barracuda104.18.17.145UCEPROTECT Level 1104.18.17.145SpamCop104.18.16.145Barracuda104.18.16.145UCEPROTECT Level 1104.18.16.145

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=czbooks.net" \ -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=czbooks.net"

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

Watch czbooks.net. 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