What technology does constellation.com use?

constellation.com is built with Bootstrap, jQuery, Apache.

Is constellation.com secure (HTTPS)?

Yes. constellation.com uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Oct 30, 2026.

Who hosts constellation.com?

Hosting provider information for constellation.com is not available yet.

What is constellation.com's SEO score?

constellation.com scored 70/100 for SEO in the latest analysis (fair).

What is constellation.com's overall website score?

constellation.com has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.

constellation.com

Electricity Provider & Gas Supplier | Constellation

Last scanned Jul 26, 2026, 7:46 AM

Overall score

Great

Summary

Join millions of residential, public sector & business customers who use Constellation as their trusted electricity & natural gas supplier. This website uses Apache. SEO is fair (70/100) and accessibility is excellent (90/100). Security scores good (80/100) and performance excellent (100/100). Top issue: No H1 heading found.

Join millions of residential, public sector & business customers who use Constellation as their trusted electricity & natural gas supplier. Compare rates.

Top issues to fix

8 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
2 cookies without Secure/HttpOnly flags
Security
Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

SEO

4 issue(s) found

100

Performance

412 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

Join millions of residential, public sector & business customers who use Constellation as their trusted electricity & natural gas supplier. Compare rates.

Facebook X (Twitter)YouTube LinkedIn Instagram

Contact

Email, phone, and address published on this site's own pages.

Phone: 1-855-585-3935 8446363749 8776774355 8889007052 8554651244

Meta tags

Title: Electricity Provider & Gas Supplier | Constellation
Description: Join millions of residential, public sector & business customers who use Constellation as their trusted electricity & natural gas supplier. Compare rates.
Canonical: https://www.constellation.com/
Language: en-US
Charset: UTF-8
Viewport: width=device-width, initial-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Bootstrap jQuery Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.2
Issuer: DigiCert Inc
Subject: www.constellation.com
Valid from: Apr 15, 2026
Valid to: Oct 30, 2026
Days until expiry: 94
SAN domains: www.constellation.com, constellation.com, admin.constellation.com, renew.constellation.com, signup.constellation.com, smallbusiness.constellation.com, my.constellation.com, www.my.constellation.com, myconstellation.com, www.myconstellation.com, wyomingcommunitygas.org, www.wyomingcommunitygas.org, nebraskagas.com, www.nebraskagas.com, constellationenergy.com, www.constellationenergy.com, www.startexpower.com, attribution.constellation.com, actualzero.com, www.actualzero.com, constellationenergy.co.uk, www.constellationenergy.co.uk, constellationconnect.com, www.constellationconnect.com, shop.constellationconnect.com, alexa.constellationconnect.com, my-account.constellationconnect.com, portal.constellationconnect.com

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsEnabled
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 2 cookie(s) observed

Content & assets

Headings

H1 0 · H2 13 · H3 1

Links

113 internal · 32 external · 20 broken

Images

11 total · 1 missing alt

Scripts / Styles

23 scripts · 3 stylesheets

JS / CSS size

4.3 KB · 615 B

Page size

222 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

No H1 heading found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://constellation.com
Final URL: https://www.constellation.com/
HTTP status: 200
HTTP version: HTTP/2
Response time: 408 ms
HTML size: 222 KB
Redirect chain: https://constellation.com → https://www.constellation.com/

See something wrong on this report? Request a correction

Frequently asked questions

What technology does constellation.com use?: constellation.com is built with Bootstrap, jQuery, Apache.
Is constellation.com secure (HTTPS)?: Yes. constellation.com uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Oct 30, 2026.
Who hosts constellation.com?: Hosting provider information for constellation.com is not available yet.
What is constellation.com's SEO score?: constellation.com scored 70/100 for SEO in the latest analysis (fair).
What is constellation.com's overall website score?: constellation.com has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.