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https://doi.gov

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
94
GRADE
A
FIX
1
REVIEW
2
PASS
6
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
6 PASS 2 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.doi.gov/
200https://doi.gov/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://doi.gov/ → https://doi.gov/

Consistent

B
TLS Certificate Expiry & Recommendations
83 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

83
days left
0d 30d 60d 90d+

Recommended actions

  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
2 A records, 60 ms lookup
PASS
2 A records, 60 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 23.1.228.143, 23.1.228.173
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2a02:26f0:fd00:1a::216:f9da, 2a02:26f0:fd00:1a::216:f9d3
Info::
2 nameserver(s) configured
Got: west.ns.cloudflare.com, liz.ns.cloudflare.com
Info::
1 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 60 ms
Got: 60 ms
A23.1.228.143, 23.1.228.173
AAAA2a02:26f0:fd00:1a::216:f9da, 2a02:26f0:fd00:1a::216:f9d3
CNAME—
NSwest.ns.cloudflare.com, liz.ns.cloudflare.com
MX
0 doi-gov.mail.protection.outlook.com
TXT
SPF v=spf1 include:spf.protection.outlook.com ip4:137.227.82.0/26 ip4:137.227.134.0/...
_k93oqxa56xlshtth9cu5z18rhbf27n5
openai-domain-verification=dv-z1QahsCTwflXMhgtSZxfUNwf
CAALookup not available with standard resolver
Resolved in 60 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A
Redirect Chain
1 redirect(s), 643 ms total
PASS
1 redirect(s), 643 ms total
Info::
Single redirect
Got: https://doi.gov → https://www.doi.gov/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 643 ms total
Got: 643 ms

https://doi.gov

107 ms · HTTP/1.1

301

https://www.doi.gov/

537 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://doi.gov301107 msHTTP/1.1
2https://www.doi.gov/200537 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (25 ms)
PASS
IPv6 reachable (25 ms)
Info::
IPv6 is configured and reachable at 2a02:26f0:fd00:1a::216:f9da, 2a02:26f0:fd00:1a::216:f9d3
Got: 25 ms connect
IPv6 Ready
AAAA Records 2a02:26f0:fd00:1a::216:f9da, 2a02:26f0:fd00:1a::216:f9d3 Connection Reachable (25 ms)
A+
Crawlability
robots.txt present, sitemap with 3 URLs
PASS
robots.txt present, sitemap with 3 URLs
Info::
robots.txt is present
Got: 2289 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 3 entries
Info::
Sitemap index with 3 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2289 B Sitemaps referenced 4 User-agents * Blocking No — crawling allowed
#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used:    http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html

User-agent: *
# CSS, JS, Images
Allow: /core/*.css$
Allow: /core/*.css?
Allow: /core/*.js$
Allow: /core/*.js?
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/
Disallow: /profiles/
# Files
Disallow: /README.md
Disallow: /composer/Metapackage/README.txt
Disallow: /composer/Plugin/ProjectMessage/README.md
Disallow: /composer/Plugin/Scaffold/README.md
Disallow: /composer/Plugin/VendorHardening/README.txt
Disallow: /composer/Template/README.txt
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
Disallow: /web.config
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed

# DOI.gov additions

Crawl-delay: 1
Sitemap: https://www.doi.gov/sitemap.xml
Sitemap: https://www.doi.gov/sitemaps/default/sitemap.xml
Sitemap: https://www.doi.gov/sitemaps/document-library/sitemap.xml
Sitemap: https://www.doi.gov/sitemaps/doi-news/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 3 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
doi.gov — via get.gov, 28 years, 11 months old
PASS
doi.gov — via get.gov, 28 years, 11 months old
Info::
Domain registered until Aug 14, 2026 (3 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: get.gov
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Domain expiry

62 days

August 14, 2026

SSL certificate

83 days

Issued by Let's Encrypt

Domain age

28 years, 11 months

Registered October 2, 1997

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2a02:26f0:fd00:1a::216:f9d3

Registrar

get.gov

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the domain or enable auto-renewal to prevent accidental expiry
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar get.gov
Created October 2, 1997 (28 years, 11 months ago)
Expires August 14, 2026 (3 months)
Last Updated August 19, 2025
Name Servers liz.ns.cloudflare.com, west.ns.cloudflare.com
DNSSEC Enabled
Registrant REDACTED FOR PRIVACY
Hosting
IP Address 2a02:26f0:fd00:1a::216:f9d3
Data source: rdap (0.4s)

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 132 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
45 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
25 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
34 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
133 ms
Total Time Total request time from DNS lookup through full response.
133 ms

Connection waterfall

DNS Lookup 45 ms TCP Connect 25 ms TLS Handshake 34 ms Server Processing 28 ms Content Transfer 0 ms
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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