Skip to content
https://nrdc.org

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
3
PASS
4
INFO
1
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
4 PASS 3 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.

C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

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.nrdc.org/
200https://nrdc.org/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://nrdc.org/ → https://www.nrdc.org/

Consistent

B
TLS Certificate Expiry & Recommendations
68 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

68
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 DNSSEC on your domain for DNS spoofing protection
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
1 A records, 38 ms lookup
PASS
1 A records, 38 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 172.104.26.72
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns3-02.azure-dns.org, ns1-02.azure-dns.com, ns2-02.azure-dns.net, ns4-02.azure-dns.info
Info::
2 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: 38 ms
Got: 38 ms
A172.104.26.72
AAAA—
CNAME—
NSns3-02.azure-dns.org, ns1-02.azure-dns.com, ns2-02.azure-dns.net, ns4-02.azure-dns.info
MX
10 mxb-0030d801.gslb.pphosted.com
10 mxa-0030d801.gslb.pphosted.com
TXT
SPF v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all
docusign=64d531ea-6334-42a0-9208-bbf4a8b0bf9a
795981589-23226688
pexip-ms-tenant-domain-verification=dc2c0cca-0666-451f-bbe0-001aa984617d
g5/aA3/CpAYFd1PtcJMCh+/M0fex9tqF9UxJv7TMt608PM6c8Y+wTpd58rJxPvN50X4WpYSC7j1pl6uE...
google-site-verification=gc_l4pkaXkT_GbFvYvA2z1TQs1LgMFaPFdJP-bqdfrY
apple-domain-verification=8MFTcrXRWQIWYOig
ciscocidomainverification=616ed4ff71808abf72d6167da65a9e3df85155f6d1101adf7360fe...
google-site-verification=zrhr9nQnHuMhostFkDekqBzebjI3L_0x7hcKLpbs0kw
CAALookup not available with standard resolver
Resolved in 38 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

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), 779 ms total
PASS
1 redirect(s), 779 ms total
Info::
Single redirect
Got: https://nrdc.org → https://www.nrdc.org/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 779 ms total
Got: 779 ms

https://nrdc.org

278 ms · HTTP/1.1

301

https://www.nrdc.org/

501 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://nrdc.org301278 msHTTP/1.1Apache
2https://www.nrdc.org/200501 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 12 URLs
PASS
robots.txt present, sitemap with 12 URLs
Info::
robots.txt is present
Got: 3735 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 12 entries
Info::
Sitemap index with 12 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 3735 B Sitemaps referenced 1 User-agents SemrushBot-BA, *, AwarioRssBot, Googlebot-News, peer39_crawler, TurnitinBot, Diffbot, FacebookBot, news-please, SiteAuditBot, SemrushBot-FT, Scrapy, AwarioSmartBot, CCBot, omgilibot, Bytespider, SemrushBot-SI, SplitSignalBot, SemrushBot-OCOB, omgili, peer39_crawler/1.0, Amazonbot, anthropic-ai, magpie-crawler, Claude-Web, cohere-ai, DataForSeoBot, SemrushBot-SWA, NewsNow 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

# Crawl delay (seconds between requests for compliant crawlers)
Crawl-delay: 10

# Disallow Rules
Disallow: /*?f[*
Disallow: /*&f[*
Disallow: /*?f%5B*
Disallow: /*&f%5B*
Disallow: /*?sort_by*
Disallow: /*&sort_by*
Disallow: /*?search_api_fulltext*
Disallow: /*&search_api_fulltext*
Disallow: *?*=*

User-agent: Amazonbot
Disallow: /

User-agent: anthropic-ai
Disallow: /

User-agent: AwarioRssBot
User-agent: AwarioSmartBot
Disallow: /

User-agent: Bytespider
Disallow: /

User-agent: CCBot
Disallow: /

User-agent: Claude-Web
Disallow: /

User-agent: cohere-ai
Disallow: /

User-agent: DataForSeoBot
Disallow: /

User-agent: Diffbot
Disallow: /

User-agent: FacebookBot
Disallow: /

User-agent: Googlebot-News
Disallow: /press-releases/

User-agent: magpie-crawler
Disallow: /

User-agent: NewsNow
Disallow: /

User-agent: news-please
Disallow: /

User-agent: omgili
Disallow: /

User-agent: omgilibot
Disallow: /

User-agent: peer39_crawler
User-agent: peer39_crawler/1.0
Disallow: /

User-agent: SiteAuditBot
Disallow: /

User-agent: SemrushBot-BA
Disallow: /

User-agent: SemrushBot-SI
Disallow: /

User-agent: SemrushBot-SWA
Disallow: /

User-agent: SplitSignalBot
Disallow: /

User-agent: SemrushBot-OCOB
Disallow: /

User-agent: SemrushBot-FT
Disallow: /

User-agent: Scrapy
Disallow: /

User-agent: TurnitinBot
Disallow: /

# Theme Files:
Allow: /themes/*.css$
Allow: /themes/*.css?
Allow: /themes/*.js$
Allow: /themes/*.js?
Allow: /themes/*.gif
Allow: /themes/*.jpg
Allow: /themes/*.jpeg
Allow: /themes/*.png
Allow: /themes/*.svg
Disallow: /themes/*.html

# Sitemap
Sitemap: https://www.nrdc.org/sitemap.xml

# Kitchen Sink page
Disallow: /kitchen-sink

# CDN and edge services
Disallow: /cdn-cgi/
sitemap.xml 200 OK
Type Sitemap Index URLs 12 entries Valid XML Yes
Child Sitemaps:
A+
HTTP Probe Timing
Total 321 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
32 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
96 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
98 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
322 ms
Total Time Total request time from DNS lookup through full response.
322 ms

Connection waterfall

DNS Lookup 32 ms TCP Connect 96 ms TLS Handshake 98 ms Server Processing 96 ms Content Transfer 0 ms
Domain Intelligence
Domain intelligence data not available
INFO
Domain intelligence data not available

RDAP and WHOIS lookup both failed

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback