Infrastructure report cardTop 5K site

irs.gov

83 out of 10016 passed8 to improve

Checked yesterday· Grading…

HTTPS & TLSA⁺

Certificate, protocol, redirect, HSTS97

DNSB

Name servers, DNSSEC, CAA, registration78

EmailB

SPF, DMARC, MTA-STS, DKIM83

Web & networkB

Security headers, IPv6, RPKI75

DependenciesB

How much hangs on one company80

HTTPS & TLS

97/100A⁺

Certificate expiry193/4
The certificate expires in 19 days.
HTTPS certificateLet's Encrypt10/10
HTTPS with a valid certificate from Let's Encrypt.
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 strengthRSA 20482/2
A strong key: RSA 2048.
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

78/100B

CAA records0/2
No CAA records: any certificate authority may issue certificates for the domain.
Name servers answer
The name servers could not be asked directly.
Name servers24/4
2 name servers for the domain.
DNSSECRSASHA2563/3
Signed with DNSSEC: resolvers can tell forged answers from real ones.

Email

83/100B

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.
DKIM
No DKIM key at the common selectors; it may use one that cannot be guessed.
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).

Web & network

75/100B

Content Security Policy0/3
No Content Security Policy: an injected script runs with the page's full rights.
Referrer-Policy0/0.5
No Referrer-Policy of its own (browsers' default applies).
Permissions-Policy0/0.5
No Permissions-Policy: embedded content may ask for camera, microphone or location.
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).
IPv64/4
www.irs.gov 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 providersCloudflare3/5
All DNS is with one provider (Cloudflare): 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: Akamai
DNS: Cloudflare
Email: Self-hosted

Routes

23.44.131.0/24AS20940RPKI valid
2600:141b:1c00::/48AS20940RPKI valid

Name servers

ns0022.secondary.cloudflare.comCloudflareAS13335
ns0227.secondary.cloudflare.comCloudflareAS13335

README badge

Show the grade in your README or docs; it updates when the domain is graded again.

[![Infrastructure grade](https://skycisa.com/grade/irs.gov/badge.svg)](https://skycisa.com/grade/irs.gov)

Compare with…

Full lookup

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