Automated public DNS and web checks; results may be incomplete. These are passive observations, not an assessment of the organization.

D69/100

Executive summary

princeton.edu

High exposure. Significant weaknesses put the brand, customers and email at risk.

Full coverage: every applicable check was assessed.

2026-11-15 18:30 UTC

Print report / PDF

Useful for your IT provider or a colleague. Anyone with the link can view the report.

Track your progress

Fix the findings, then come back and rescan. Your scan history is saved in this browser so you can see exactly what improved.

Email security29/30

Good

Spoofing email from this domain is hard.

Encryption & certificate18/25

Needs attention

Encryption is in place, but a gap could expose users.

Browser protections19/30

Needs attention

Some browser protections are missing.

DNS infrastructure3/15

Critical

The domain's infrastructure lacks basic protections.

Help someone else check their domain

Share this public report with a colleague. They can review the evidence and check their own domain.

Get the report badge

What to do first

1.
Tell browsers to always use the secure version
Helps browsers use HTTPS on future visits after they have received the policy.
Who can fix it: Your web host
How to verify after the fix
```
curl -sIL https://princeton.edu/ | grep -i "Strict-Transport-Security"
```
2.
Send visitors to the secure version of your site
Visitors who type your address without https may stay on an unprotected connection.
Who can fix it: Your web host
How to verify after the fix
```
curl -sI http://princeton.edu/ | grep -iE "^(HTTP|location)"
```

A starting point, not a security guarantee.

What this grade means

Tested hostname: princeton.edu
Website request: GET https://princeton.edu/ → https://www.princeton.edu/
Scan time: 2026-11-15 18:30:16 UTC
Grading method: Version 2How grading works
Unverified or excluded checks: None. Every applicable check was assessed.

This is a snapshot of the public configuration checks listed in this report. It does not verify the site's owner, business legitimacy, application security, or absence of vulnerabilities. It is not a security certification.

Get the badge

Show the live grade for princeton.edu in a README, docs or site footer. The badge links to the public report and refreshes every 24 hours.

Scan shown on this page: ⁦2026-11-15 18:30:16 UTC⁩. The badge may display a cached result for up to 24 hours. Open the linked report to check its scan time.

Markdown

[![Domain Armor grade](https://getmirror.online/badge/princeton.edu.svg)](https://getmirror.online/report/princeton.edu)

HTML

<a href="https://getmirror.online/report/princeton.edu"><img src="https://getmirror.online/badge/princeton.edu.svg" alt="Domain Armor grade"></a>

Badge URL

https://getmirror.online/badge/princeton.edu.svg

Scan history

AI fix plan

Pick scans from this browser's history. The AI compares them, explains what changed and builds a prioritized, step-by-step plan.

Scans to analyze

0 of 6 selected

D69/10011/15/26, 06:30 PMCurrent

The current scan is always included.

AI-generated from your scan results only. Review each step before applying it; nothing is sent to or changed on the domain.

Technical detail

Click a check to see the public data, a verification command, a safe fix recommendation and documentation sources.

Email security

29/30

Encryption & certificate

18/25

Browser protections

19/30

DNS infrastructure

3/15

Public DNS records

A	princeton.edu	140.180.223.22
AAAA	princeton.edu	—
MX	princeton.edu	10 princeton-edu.mail.protection.outlook.com
NS	princeton.edu	a7-65.akam.net ns6.dnsmadeeasy.com a24-66.akam.net a1-158.akam.net a3-67.akam.net ns7.dnsmadeeasy.com ns5.dnsmadeeasy.com a6-64.akam.net a20-65.akam.net
TXT	princeton.edu	adobe-idp-site-verification=73f4a96f-50ca-4b7f-858e-6cef4af902aa C78F4E9C8396BB82985F96559095BB93 31700bde-e486-4938-a359-8e497173042b kwaacu+go+erbui7ikfpg6udfqlprkz9e2pxxeafjplnmhnkyjnfg0uokvami2f8iz7qet4dr+j8ou3/k7lz0a== 14EB47BE09914AA33EF9D9ED5A9BFEFF apple-domain-verification=M2IB2C41pkMXfS91 R6TEJ9GJ2ECTYPQRT0T76RZIKOG4TQV1Z6TD75P33 brevo-code:f80999df7fc32e2373bd2e3f47df53c1 jamf-site-verification=gOHFT5mfGhE1m6aC3XEdag 57dmsH4y22BIE+OMFrnNvGtt3xyyh2Z/XhvRbQfkhMSIMh88zNcjCr/Bj0nOzrEDguiuGBxFOcYuCiw5hfnvDg== google-site-verification=9spyuhtdpgltj4ba6qol87mlltsvqwtwpfpjckhxuaa atlassian-domain-verification=uT+jiLnKmr+CvFxx3GGJaEAobMxLzqz6Kl+AO4ha-HGmEtTXuiNTu7uqG1zePfpI v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all verifying for Netlify support case #19507 airtable-verification=f404295b37024f7747d2de8944a93fee anthropic-domain-verification-ymbamp=9m87xWM7BYZwJSc80lcSy4QpO docusign=9b74122b-7e36-4311-9fd4-a1f8200928a9 F7EB4C8A0066246BC47806F4272AA19A openai-domain-verification=dv-ri2VCR2MpMXhB1YKDbAAsBWA paloaltonetworks-site-verification=fb3d98b6d82f4593542f655e32a264fe763b0b1ce0a80f5ceccc5c5d0feff519 3E9C4486F3765CF5CE2AE23299F5A81E ms=ms98806852 google-site-verification=fxbfrfkt_fmpamiadsiqhygwsrxgcfsmxpkveva7bhk google-site-verification=G9LehBu6F6NlP7N7c6lb7_dJ59z-b49Hd_AY38O27BA dropbox-domain-verification=xf71iopc45pc docusign=8ee25fec-197b-476d-9659-5a3717059bc0 github-verification=fRwTRsEqERcBV3GgKMdt4RYrb8CWTfLrN72Z5WdW
TXT	_dmarc.princeton.edu	v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com
CAA	princeton.edu	—
DS	princeton.edu	—

Fix priorities

Sorted by risk: severity first, confirmed issues before hardening gaps, then effort and score impact.

1HighHSTS — enforce encryption in the browserHardening gap+8
2HighHTTP → HTTPS redirectHardening gap+7
3MediumDNSSEC — signed DNS recordsHardening gap+7
4LowCAA — who may issue certificatesHardening gap+5
5LowCSP — protection from script injectionHardening gap+3

Indicative alignment

Best-practice mapping of public findings to common frameworks. Passive scanning tests public configuration only; it doesn't prove compliance or a violation.

Google & Yahoo sender rulesNo gaps observed
SPF, DKIM and DMARC are required for bulk senders to Gmail and Yahoo; missing them risks rejected or spam-foldered mail.
PCI DSS v4.03 observed gaps
TLS, certificate and browser-header protections relate to PCI DSS v4.0 requirements 4.2 and 6.4 for payment pages.
HTTP → HTTPS redirect HSTS — enforce encryption in the browser CSP — protection from script injection
NIS2 / vendor due diligence3 observed gaps
Vendor risk reviews under NIS2/DORA and cyber-insurance questionnaires check these public signals.
HSTS — enforce encryption in the browser DNSSEC — signed DNS records CAA — who may issue certificates
SOC 2 / ISO 27001 baseline2 observed gaps
Baseline external hygiene commonly expected in SOC 2 and ISO 27001 audits.
HSTS — enforce encryption in the browser CSP — protection from script injection

Indicative alignment only, based on public configuration. It doesn't establish whether a framework applies to you, and it isn't legal advice, an audit or a certification.

Head-to-head vs competitor

How do you stack up against competitors?

The check reads public data only and makes no changes to the domain. Recommendations are intended for the domain owner.

Is your domain as secure? Scan it free, no sign-up

All pre-scanned domains

What to do first

Tell browsers to always use the secure version

Helps browsers use HTTPS on future visits after they have received the policy.

Who can fix it: Your web host

How to verify after the fix

curl -sIL https://princeton.edu/ | grep -i "Strict-Transport-Security"

Send visitors to the secure version of your site

Visitors who type your address without https may stay on an unprotected connection.

Who can fix it: Your web host

How to verify after the fix

curl -sI http://princeton.edu/ | grep -iE "^(HTTP|location)"

What this grade means

Tested hostname

princeton.edu

Website request

GET https://princeton.edu/ → https://www.princeton.edu/

Scan time

2026-11-15 18:30:16 UTC

Grading method

Version 2How grading works

Unverified or excluded checks

None. Every applicable check was assessed.

Technical detail

Click a check to see the public data, a verification command, a safe fix recommendation and documentation sources.

Email security

29/30

Encryption & certificate

18/25

Browser protections

19/30

DNS infrastructure

3/15

Public DNS records

A	princeton.edu	140.180.223.22
AAAA	princeton.edu	—
MX	princeton.edu	10 princeton-edu.mail.protection.outlook.com
NS	princeton.edu	a7-65.akam.net ns6.dnsmadeeasy.com a24-66.akam.net a1-158.akam.net a3-67.akam.net ns7.dnsmadeeasy.com ns5.dnsmadeeasy.com a6-64.akam.net a20-65.akam.net
TXT	princeton.edu	adobe-idp-site-verification=73f4a96f-50ca-4b7f-858e-6cef4af902aa C78F4E9C8396BB82985F96559095BB93 31700bde-e486-4938-a359-8e497173042b kwaacu+go+erbui7ikfpg6udfqlprkz9e2pxxeafjplnmhnkyjnfg0uokvami2f8iz7qet4dr+j8ou3/k7lz0a== 14EB47BE09914AA33EF9D9ED5A9BFEFF apple-domain-verification=M2IB2C41pkMXfS91 R6TEJ9GJ2ECTYPQRT0T76RZIKOG4TQV1Z6TD75P33 brevo-code:f80999df7fc32e2373bd2e3f47df53c1 jamf-site-verification=gOHFT5mfGhE1m6aC3XEdag 57dmsH4y22BIE+OMFrnNvGtt3xyyh2Z/XhvRbQfkhMSIMh88zNcjCr/Bj0nOzrEDguiuGBxFOcYuCiw5hfnvDg== google-site-verification=9spyuhtdpgltj4ba6qol87mlltsvqwtwpfpjckhxuaa atlassian-domain-verification=uT+jiLnKmr+CvFxx3GGJaEAobMxLzqz6Kl+AO4ha-HGmEtTXuiNTu7uqG1zePfpI v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all verifying for Netlify support case #19507 airtable-verification=f404295b37024f7747d2de8944a93fee anthropic-domain-verification-ymbamp=9m87xWM7BYZwJSc80lcSy4QpO docusign=9b74122b-7e36-4311-9fd4-a1f8200928a9 F7EB4C8A0066246BC47806F4272AA19A openai-domain-verification=dv-ri2VCR2MpMXhB1YKDbAAsBWA paloaltonetworks-site-verification=fb3d98b6d82f4593542f655e32a264fe763b0b1ce0a80f5ceccc5c5d0feff519 3E9C4486F3765CF5CE2AE23299F5A81E ms=ms98806852 google-site-verification=fxbfrfkt_fmpamiadsiqhygwsrxgcfsmxpkveva7bhk google-site-verification=G9LehBu6F6NlP7N7c6lb7_dJ59z-b49Hd_AY38O27BA dropbox-domain-verification=xf71iopc45pc docusign=8ee25fec-197b-476d-9659-5a3717059bc0 github-verification=fRwTRsEqERcBV3GgKMdt4RYrb8CWTfLrN72Z5WdW
TXT	_dmarc.princeton.edu	v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com
CAA	princeton.edu	—
DS	princeton.edu	—

Indicative alignment

Best-practice mapping of public findings to common frameworks. Passive scanning tests public configuration only; it doesn't prove compliance or a violation.

Google & Yahoo sender rulesNo gaps observed

SPF, DKIM and DMARC are required for bulk senders to Gmail and Yahoo; missing them risks rejected or spam-foldered mail.

PCI DSS v4.03 observed gaps

TLS, certificate and browser-header protections relate to PCI DSS v4.0 requirements 4.2 and 6.4 for payment pages.

HTTP → HTTPS redirect HSTS — enforce encryption in the browser CSP — protection from script injection

NIS2 / vendor due diligence3 observed gaps

Vendor risk reviews under NIS2/DORA and cyber-insurance questionnaires check these public signals.

HSTS — enforce encryption in the browser DNSSEC — signed DNS records CAA — who may issue certificates

SOC 2 / ISO 27001 baseline2 observed gaps

Baseline external hygiene commonly expected in SOC 2 and ISO 27001 audits.

HSTS — enforce encryption in the browser CSP — protection from script injection

Indicative alignment only, based on public configuration. It doesn't establish whether a framework applies to you, and it isn't legal advice, an audit or a certification.

princeton.edu

Track your progress

Help someone else check their domain

What to do first

What this grade means

Get the badge

Scan history

AI fix plan

Scans to analyze

Technical detail

Email security

Encryption & certificate

Browser protections

DNS infrastructure

Public DNS records

Is your domain as secure? Scan it free, no sign-up

princeton.edu

Track your progress

Help someone else check their domain

What to do first

What this grade means

Get the badge

Scan history

AI fix plan

Scans to analyze

Technical detail

Email security

Encryption & certificate

Browser protections

DNS infrastructure

Public DNS records

Is your domain as secure? Scan it free, no sign-up

Agent access & discovery signals