whatsapp.com
HTTPS & TLS
81/100B- Certificate expiry81/4
The certificate expires in 8 days: renewal looks overdue.
- Old protocolsTLS 1.10/3
Still accepts TLS 1.1, retired by browsers in 2020 and open to downgrade attacks.
- HTTPS certificateDigiCert Inc10/10
HTTPS with a valid certificate from DigiCert Inc.
- TLS versionTLS 1.34/4
Negotiates TLS 1.3, the current protocol: faster handshakes, forward secrecy always.
- Key strengthECDSA P-2562/2
A strong key: ECDSA P-256.
- HTTP → HTTPS3013/3
http:// redirects straight to https://.
- HSTS1 year · preload4/4
HSTS tells browsers to use HTTPS only, for 1 year.
- HTTP/2 and HTTP/3HTTP/32/2
HTTP/2 and HTTP/3.
DNS
79/100B- DNSSEC0/3
Not signed with DNSSEC: a forged DNS answer for the domain cannot be told from the real one.
- Name servers44/4
4 name servers for the domain.
- Name servers answer4/45/5
Every name server answers for the domain, with the same version of the zone.
- CAA recordsdigicert.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.
- SPF-all5/5
SPF lists the servers allowed to send its mail and rejects the rest (-all).
- DMARCreject7/7
DMARC tells receivers to reject mail that fakes the domain (p=reject).
- DKIMgoogle2/2
A DKIM key is published (selector google), so its mail can be signed.
Web & network
97/100A+- Referrer-Policy0/0.5
No Referrer-Policy of its own (browsers' default applies).
- 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).
- Permissions-Policy0.5/0.5
Permissions-Policy turns off browser features the site does not use.
- IPv64/4
www.whatsapp.com is reachable over IPv6 as well as IPv4.
- RPKIvalid4/4
The route to the website is RPKI-valid: networks can reject hijacked announcements of it.
Dependencies
80/100B- DNS providerswhatsapp.net3/5
All DNS is with one provider (whatsapp.net): an outage there takes the domain offline, as Dyn's did in 2016.
- One company for everything5/5
The website, DNS and email do not all hang on one company.
Who runs it
- Website
- Meta
- DNS
- whatsapp.net
- Proofpoint
Routes
- 57.144.244.0/23AS32934RPKI valid
- 2a03:2880:f37a::/48AS32934RPKI valid
Name servers
- a.ns.whatsapp.netwhatsapp.netAS32934
- b.ns.whatsapp.netwhatsapp.netAS32934
- c.ns.whatsapp.netwhatsapp.netAS32934
- d.ns.whatsapp.netwhatsapp.netAS32934
README badge
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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