How is letsencrypt.org?
Looks fine
risk 0/100
Registered 12 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 50 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
50 ms
HTTPS
35 d
left on a Let's Encrypt certificate
Age
12 years
registered 2014-07-07
Blocklists
0
listings across 5 lists
Everything we looked at
DNS records6 record types
| A | 98.84.224.111 18.208.88.157 |
|---|---|
| AAAA | 2600:1f18:16e:df01::258 2600:1f18:16e:df01::259 |
| MX | 10 aspmx2.googlemail.com 5 alt1.aspmx.l.google.com 5 alt2.aspmx.l.google.com 10 aspmx3.googlemail.com 1 aspmx.l.google.com |
| NS | vera.ns.cloudflare.com owen.ns.cloudflare.com |
| TXT | sending_domain1011011=f98c68e7636a708a1987c7b9da300d64a354041fa41ea2039fbb02bc18c4ed0f pardot1011011=d160caff32c4415bb46bb82d8c50e5bea7ea1a74f5a149cb96bd952467266044 anthropic-domain-verification-eer9ky=uy5e3EOy8j15k1u9UesevyP1N v=spf1 include:_spf.google.com ip4:23.178.112.0/24 ip4:66.133.109.36 ip4:64.78.152.132 include:mail.zendesk.com include:_spf.intacct.com -all |
| CAA | {'type': 'CAA', 'critical': 0, 'issuewild': 'ssl.com'} {'type': 'CAA', 'issue': 'ssl.com', 'critical': 0} {'type': 'CAA', 'issue': 'sectigo.com', 'critical': 0} {'type': 'CAA', 'issue': 'pki.goog', 'critical': 0} {'type': 'CAA', 'critical': 0, 'issuewild': 'www.digicert.com'} {'type': 'CAA', 'critical': 0, 'issuewild': 'pki.goog'} {'type': 'CAA', 'issue': 'www.digicert.com', 'critical': 0} {'type': 'CAA', 'critical': 0, 'issuewild': 'letsencrypt.org'} {'type': 'CAA', 'issue': 'amazon.com', 'critical': 0} {'type': 'CAA', 'critical': 0, 'issuewild': 'sectigo.com'} {'type': 'CAA', 'critical': 0, 'issuewild': 'amazon.com'} {'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0} |
RegistrationCloudflare, Inc.
| registrar | Cloudflare, Inc. |
|---|---|
| registered | 2014-07-07 |
| expires | 2027-07-07 |
| last changed | 2026-08-12 |
| owner | DATA REDACTED |
| nameservers | owen.ns.cloudflare.com vera.ns.cloudflare.com |
| status | client delete prohibited client transfer prohibited client update prohibited |
registered 2014-07-07expires 2027-07-07
HTTPS certificate35 days left
| valid | yes |
|---|---|
| issuer | Let's Encrypt |
| covers | cp.letsencrypt.org, cp.root-x1.letsencrypt.org, cps.letsencrypt.org, cps.root-x1.letsencrypt.org, lencr.org, letsencrypt.com, letsencrypt.org, www.lencr.org, www.letsencrypt.com, www.letsencrypt.org |
| protocol | TLSv1.3 |
issued 2026-09-04expires 2026-12-03
DNSSECinsecure
Domain is not signed with DNSSEC
. → org → letsencrypt.org
Email authenticationexcellent
| SPF | pass v=spf1 include:_spf.google.com ip4:23.178.112.0/24 ip4:66.133.109.36 ip4:64.78.152.132 include:mail.zendesk.com include:_spf.intacct.com -all |
|---|---|
| DMARC | pass policy reject |
| DKIM | found: google |
Whether mail claiming to be from this domain can be checked as genuine.
Security scoregrade A · 175/205
Basic Security10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security45/45missing: DKIM Presence
Advanced Security25/25
Domain Reputation50/50
Threat Detection45/45missing: Domain Age Check
Blocklists0 listings · 8 lookups
SURBL MultidomainURIBL MultidomainSpamCop98.84.224.111Barracuda98.84.224.111UCEPROTECT Level 198.84.224.111SpamCop18.208.88.157Barracuda18.208.88.157UCEPROTECT Level 118.208.88.157
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=letsencrypt.org" \
-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=letsencrypt.org"
MCP: add https://how.is/mcp to Claude, Codex or Cursor
(one-line install) and ask for domain_trust on letsencrypt.org.
Reference: /llms.txt.
Watch letsencrypt.org. 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