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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from New York, United Stated
301 Moved Permanently
Checks
9
5 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

C
URL Variants
Action
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
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.osti.gov/
200https://osti.gov/

Inconsistent — duplicate content risk

HTTP → HTTPS

302http://osti.gov/ → https://osti.gov/

Use 301 (permanent) instead of 302 (temporary)

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

Certificate validity

135
days left
0d 30d 60d 90d+

Recommended actions

  • Submit your domain to hstspreload.org to be added to the Chrome preload list
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
1 A records, 6 ms lookup
PASS
1 A records, 6 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 192.107.175.222
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: edns1.ultradns.biz, edns1.ultradns.com, edns1.ultradns.net, edns1.ultradns.org
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: 6 ms
Got: 6 ms
A192.107.175.222
AAAA—
CNAME—
NSedns1.ultradns.biz, edns1.ultradns.com, edns1.ultradns.net, edns1.ultradns.org
MX
10 mxb-001d2d01.gslb.gpphosted.com
10 mxa-001d2d01.gslb.gpphosted.com
TXT
apple-domain-verification=TuByGWnIxOIvM8LY
bw=jRpq2U7+II3/FzYaEiwpCnh3ZDGH28AuUkrKYPYh/8yw
google-site-verification=FOxfJAYfF6bUxk-DcOPrVwdjGe7Ii4243_HudkOH5e0
SPF v=spf1 ip4:192.107.175.4 ip4:192.107.175.11 ip4:192.107.175.223 ip4:205.254.128....
CAALookup not available with standard resolver
Resolved in 6 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), 233 ms total
PASS
1 redirect(s), 233 ms total
Info::
Single redirect
Got: https://osti.gov → https://www.osti.gov/ (301)
Info::
WWW normalization redirect

https://osti.gov

114 ms · HTTP/1.1

301

https://www.osti.gov/

119 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://osti.gov301114 msHTTP/1.1Apache
2https://www.osti.gov/200119 msHTTP/1.1Apache

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 607 URLs
PASS
robots.txt present, sitemap with 607 URLs
Info::
robots.txt is present
Got: 2548 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 607 entries
Info::
Sitemap index with 607 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2548 B Sitemaps referenced 7 User-agents *, Bingbot, Baiduspider, SemrushBot, Googlebot, YandexBot, dotbot, MauiBot, Semrush Blocking No — crawling allowed
User-agent: Googlebot
Disallow: /account
Disallow: /dataexplorer/account
Disallow: /dataexplorer/search
Disallow: /doepatents/search
Disallow: /etdeweb/results
Disallow: /opennet/document
Disallow: /opennet/search-results
Disallow: /opennetadmin/
Disallow: /pages/account
Disallow: /pages/search
Disallow: /sciencecinema/account
Disallow: /sciencecinema/search
Disallow: /search/
Disallow: /includes
Disallow: /doestem


User-agent: Bingbot
Disallow: /account
Disallow: /dataexplorer/account
Disallow: /dataexplorer/search
Disallow: /doepatents/search
Disallow: /etdeweb/results
Disallow: /opennet/document
Disallow: /opennet/search-results
Disallow: /opennetadmin/
Disallow: /pages/account
Disallow: /pages/search
Disallow: /sciencecinema/account
Disallow: /sciencecinema/search
Disallow: /search/
Disallow: /includes


User-agent: YandexBot
Crawl-delay: 1
Disallow: /account
Disallow: /dataexplorer/account
Disallow: /dataexplorer/search
Disallow: /doepatents/search
Disallow: /etdeweb/results
Disallow: /opennet/document
Disallow: /opennet/search-results
Disallow: /opennetadmin/
Disallow: /pages/account
Disallow: /pages/search
Disallow: /sciencecinema/account
Disallow: /sciencecinema/search
Disallow: /search/
Disallow: /includes


User-agent: Baiduspider
Crawl-delay: 1
Disallow: /account
Disallow: /dataexplorer/account
Disallow: /dataexplorer/search
Disallow: /doepatents/search
Disallow: /etdeweb/results
Disallow: /opennet/document
Disallow: /opennet/search-results
Disallow: /opennetadmin/
Disallow: /pages/account
Disallow: /pages/search
Disallow: /sciencecinema/account
Disallow: /sciencecinema/search
Disallow: /search/
Disallow: /includes


User-agent: dotbot
Disallow: /


User-agent: MauiBot
Disallow:/


User-agent: Semrush
Disallow:/


User-agent: SemrushBot
Disallow:/


User-Agent: *
Disallow: /account
Disallow: /dataexplorer/account
Disallow: /dataexplorer/search
Disallow: /doepatents/search
Disallow: /etdeweb/results
Disallow: /opennet/document
Disallow: /opennet/search-results
Disallow: /opennetadmin/
Disallow: /pages/account
Disallow: /pages/search
Disallow: /sciencecinema/account
Disallow: /sciencecinema/search
Disallow: /search/
Disallow: /includes


Sitemap: https://www.osti.gov/sitemap_ostigov/xml
Sitemap: https://www.osti.gov/pages/sitemap/xml
Sitemap: https://www.osti.gov/sciencecinema/sitemap/xml
Sitemap: https://www.osti.gov/dataexplorer/sitemap/xml
Sitemap: https://www.osti.gov/doepatents/sitemap/xml
Sitemap: https://www.osti.gov/opennet/sitemap/xml
Sitemap: https://www.osti.gov/etdeweb/sitemap/xml
sitemap.xml 200 OK
Type Sitemap Index URLs 607 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
osti.gov — via get.gov, 28 years, 11 months old, hosted on ESNET - ESnet, US
PASS
osti.gov — via get.gov, 28 years, 11 months old, hosted on ESNET - ESnet, US
Info::
Domain registered until Aug 11, 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.
Info::
Hosting: ESNET - ESnet, US
Got: AS293
Domain expiry

28 days

August 11, 2026

SSL certificate

135 days

Issued by Sectigo Limited

Domain age

28 years, 11 months

Registered October 2, 1997

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

ESNET - ESnet, US

ASN AS293

192.107.175.222

Registrar

get.gov

Unlocked 4 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 11, 2026 (3 months)
Last Updated August 16, 2025
Name Servers edns1.ultradns.biz, edns1.ultradns.com, edns1.ultradns.net, edns1.ultradns.org
DNSSEC Enabled
Registrant REDACTED FOR PRIVACY
Hosting
IP Address 192.107.175.222
ASN AS293 (ESNET - ESnet, US)
Provider ESNET - ESnet, US
Data source: rdap (0.3s)

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 107 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
5 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.
51 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
108 ms
Total Time Total request time from DNS lookup through full response.
108 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 25 ms TLS Handshake 51 ms Server Processing 27 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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