Infrastructure report cardTop 1K site

yahoo.com

87 out of 10020 passed5 to improve

Checked 2 days ago· Grading…

HTTPS & TLSA⁺

Certificate, protocol, redirect, HSTS100

DNSB

Name servers, DNSSEC, CAA, registration79

EmailA

SPF, DMARC, MTA-STS, DKIM86

Web & networkC

Security headers, IPv6, RPKI69

DependenciesA⁺

How much hangs on one company100

HTTPS & TLS

100/100A⁺

HTTPS certificateDigiCert Inc10/10
HTTPS with a valid certificate from DigiCert Inc.
Certificate expiry364/4
The certificate is valid for another 36 days.
TLS versionTLS 1.34/4
Negotiates TLS 1.3, the current protocol: faster handshakes, forward secrecy always.
Old protocols3/3
Refuses the retired TLS 1.0 and 1.1.
Key strengthECDSA P-2562/2
A strong key: ECDSA P-256.
HTTP → HTTPS3013/3
http:// redirects straight to https://.
HSTS1 year4/4
HSTS tells browsers to use HTTPS only, for 1 year.
HTTP/2 and HTTP/3HTTP/22/2
HTTP/2.

DNS

79/100B

DNSSEC0/3
Not signed with DNSSEC: a forged DNS answer for the domain cannot be told from the real one.
Name servers54/4
5 name servers for the domain.
Name servers answer5/55/5
Every name server answers for the domain, with the same version of the zone.
CAA recordsglobalsign.com, digicert.com, sectigo.com2/2
CAA records name the authorities allowed to issue its certificates.

Email

86/100A

MTA-STStesting1/2
MTA-STS is in testing mode: failures are reported, not prevented.
DKIM
No DKIM key at the common selectors; it may use one that cannot be guessed.
SPFredirect4/5
SPF follows another domain's policy (redirect=).
DMARCreject7/7
DMARC tells receivers to reject mail that fakes the domain (p=reject).
TLS reporting0.5/0.5
TLS reporting: senders report failed encrypted deliveries.

Web & network

69/100C

Content Security Policypartial1.5/3
A Content Security Policy is sent, but it does not limit scripts.
Permissions-Policy0/0.5
No Permissions-Policy: embedded content may ask for camera, microphone or location.
RPKIunknown1/4
The route to the website is not covered by RPKI, so a hijack of it cannot be told apart.
X-Content-Type-Options2/2
X-Content-Type-Options: nosniff stops browsers guessing file types.
Framing2/2
Other sites cannot frame its pages (clickjacking protection).
Referrer-Policyno-referrer-when-downgrade0.5/0.5
Referrer-Policy limits what other sites learn about where visitors came from.
IPv64/4
www.yahoo.com is reachable over IPv6 as well as IPv4.

Dependencies

100/100A⁺

DNS providersSelf-hosted5/5
DNS is served from 4 separate networks.
One company for everything5/5
The website, DNS and email do not all hang on one company.

Who runs it

Website: YAHOO
DNS: Self-hosted
Email: yahoodns.net

Routes

188.125.94.0/24AS10310RPKI unknown
2a00:1288:84::/48AS203219RPKI unknown

Name servers

ns1.yahoo.comSelf-hostedAS10880
ns2.yahoo.comSelf-hostedAS7280
ns3.yahoo.comSelf-hostedAS23879
ns4.yahoo.comSelf-hostedAS36646
ns5.yahoo.comSelf-hostedAS10880

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What is graded

HTTPS & TLS · 25%

A valid certificate (an invalid one means F), its expiry against its lifetime, TLS 1.3, no TLS 1.0/1.1 (else at most B), http:// sent straight to https://, HSTS, HTTP/2.

DNS · 20%

At least two name servers that all answer and agree, DNSSEC, CAA records, and a registration that is not about to expire.

Email · 20%

SPF, a DMARC policy that rejects forgeries (none means at most B), MTA-STS and TLS reporting for domains that take mail, DKIM at common selectors.

Web & network · 20%

Content Security Policy, nosniff, framing protection, Referrer- and Permissions-Policy, IPv6, and an RPKI-valid route (invalid means at most C).

Dependencies · 15%

DNS from more than one provider, and the website, DNS and email not all with one company.

A+ 95–100 · A 85–94 · B 75–84 · C 65–74 · D 50–64 · F below 50