citi.com
HTTPS & TLS
94/100A- TLS versionTLS 1.22/4
Negotiates TLS 1.2 at best; TLS 1.3 is faster and drops old ciphers.
- HTTPS certificateDigiCert Inc10/10
HTTPS with a valid certificate from DigiCert Inc.
- Certificate expiry554/4
The certificate is valid for another 55 days.
- Old protocols3/3
Refuses the retired TLS 1.0 and 1.1.
- Key strengthRSA 20482/2
A strong key: RSA 2048.
- HTTP → HTTPS3013/3
http:// redirects straight to https://.
- HSTS2 years4/4
HSTS tells browsers to use HTTPS only, for 2 years.
- 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 servers24/4
2 name servers for the domain.
- Name servers answer2/25/5
Every name server answers for the domain, with the same version of the zone.
- CAA recordsdigicert.com, globalsign.com2/2
CAA records name the authorities allowed to issue its certificates.
- MTA-STS0/2
No MTA-STS: mail to the domain can be read in transit by stripping its encryption.
- TLS reporting0/0.5
No TLS reporting: failed encrypted deliveries go unnoticed.
- SPFredirect4/5
SPF follows another domain's policy (redirect=).
- DMARCreject7/7
DMARC tells receivers to reject mail that fakes the domain (p=reject).
- DKIMs12/2
A DKIM key is published (selector s1), so its mail can be signed.
Web & network
72/100C- Permissions-Policy0/0.5
No Permissions-Policy: embedded content may ask for camera, microphone or location.
- IPv60/4
www.citi.com has no IPv6 address: IPv6-only networks reach it only through translation.
- Content Security Policy3/3
A Content Security Policy limits which scripts the pages run.
- 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-referrer0.5/0.5
Referrer-Policy limits what other sites learn about where visitors came from.
- RPKIvalid4/4
The route to the website is RPKI-valid: networks can reject hijacked announcements of it.
Dependencies
100/100A+- DNS providersnsroot1.com, nsroot2.com5/5
DNS is served by 2 providers: one can fail without taking the domain offline.
- One company for everything5/5
The website, DNS and email do not all hang on one company.
Who runs it
- Website
- Akamai
- DNS
- nsroot1.comnsroot2.com
- Self-hosted
Routes
- 23.210.160.0/20AS16625RPKI valid
Name servers
- ns1.nsroot1.comnsroot1.comAS12008
- ns2.nsroot2.comnsroot2.comAS21342
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What is graded
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.
At least two name servers that all answer and agree, DNSSEC, CAA records, and a registration that is not about to expire.
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.
Content Security Policy, nosniff, framing protection, Referrer- and Permissions-Policy, IPv6, and an RPKI-valid route (invalid means at most C).
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