astrometry.net website report
Astrometry.net
Last scanned · 1 view
Overall score
Fair
About astrometry.net
astrometry.net is a website. The site is hosted on NYU-DOMAIN - New York University, US.
Score profile
Top issues to fix
12 issues found · 4 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
+6 more issues — details in the sections below.
How it compares
astrometry.net scores higher overall than 27% of the 163,243 sites we have scanned.
vs. All scanned sites
163,243 sitesThe dot is this site; the tick is the typical (median) score for the group. The number on the right is the percentile: the share of the group this site scores above.
Technology stack
astrometry.net is built with Nginx.
Servers (1)
Hosting & DNS
astrometry.net is hosted on NYU-DOMAIN - New York University, US (servers registered in US).
- IP address
- 216.165.26.52
- ASN
- AS12 · NYU-DOMAIN - New York University, US
- IPv6
- Not supported
- HTTP
- HTTP/1.1
Show DNS record values
- A
- 216.165.26.52
- MX
- mail.astrometry.net
- NS
- ns-91-b.gandi.net, ns-85-a.gandi.net, ns-185-c.gandi.net
TXT record contents are not republished; only their count is shown.
Security
astrometry.net uses TLS 1.2 with a certificate valid for 45 more days and sets 0 of 6 recommended security headers.
Security headers0 of 6 set
- HSTSForces HTTPS
- CSPBlocks injected scripts
- X-Frame-OptionsStops clickjacking
- X-Content-TypeStops MIME sniffing
- Referrer-PolicyLimits URL leakage
- Permissions-PolicyRestricts browser features
TLS certificate
- Names covered
- 1
- Cookies set
- 0
Email security
astrometry.net scores F for email security, with SPF and no DMARC policy.
- SPFWeak
Marks unlisted senders as suspicious (~all) but does not reject them.
- DMARCNot set
No DMARC policy: forged mail is not told to be rejected.
- MTA-STSNot set
Not published; mail to this domain can be downgraded to plaintext.
- BIMINot set
Not published (optional).
Performance & carbon
astrometry.net scores 100/100 for performance, with an estimated load time of 0.2 s. A visit emits an estimated 0.00 g of CO2 (grade A+).
Page weight
- HTML 2.2 KB
- CSS 1.6 KB
- Est. load
- 230 ms
- Response
- 230 ms
- Scripts / CSS
- 0 / 1
Carbon per visitA+
0.00 g CO2 per uncached view
Estimate from the Sustainable Web Design model. HTML, JavaScript and CSS only; images, video and fonts are not measured. Treat it as a lower bound for comparing pages, not an audit.
SEO & accessibility
astrometry.net scores 60/100 for SEO and 85/100 for accessibility, with 6 SEO issues to fix.
Heading structure
One H1: good.
Image alt text
0 images · 0 without alt text · 0 lazy-loaded
Links
- Internal 9
- External 1
SEO issues6
- Missing meta description
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues2
- Missing <html lang> attribute
- Missing viewport meta tag
Technical details
Page metadata, social tags, crawl files and scan information.
Meta tags
- Title
- Astrometry.net
- Description
- Canonical
- Language
- Robots meta
Crawl files
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
Structured data
No JSON-LD types declared.
- Microdata items
- 0
- RDFa items
- 0
Scan
- Final URL
- https://astrometry.net
- HTTP status
- 200
- Redirects
- https://astrometry.net
- Scanned
- Aug 24, 2026, 1:22 PM
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<a href="https://sitegraph.tech/site/astrometry-net"><img src="https://sitegraph.tech/badge/astrometry-net.svg" alt="astrometry.net on SiteGraph" width="190" height="20" /></a>See something wrong on this report? Request a correction or ask for something to be removed.
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Frequently asked questions about astrometry.net
- What is astrometry.net?
- astrometry.net is a website. The site is hosted on NYU-DOMAIN - New York University, US.
- What technology does astrometry.net use?
- astrometry.net is built with Nginx.
- Who hosts astrometry.net?
- astrometry.net is hosted on NYU-DOMAIN - New York University, US (servers registered in US).
- Is astrometry.net secure?
- astrometry.net uses TLS 1.2 with a certificate valid for 45 more days and sets 0 of 6 recommended security headers.
- Is astrometry.net protected against email spoofing?
- astrometry.net scores F for email security, with SPF and no DMARC policy.
- How does astrometry.net compare with similar sites?
- astrometry.net scores higher overall than 27% of the 163,243 sites we have scanned.
- What is astrometry.net's overall score?
- astrometry.net has an overall SiteGraph score of 76/100, combining SEO (60), performance (100), security (65) and accessibility (85).
Open Graph & Twitter