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

B88/100

Executive summary

slack.com

Good shape, with a few gaps worth closing this quarter.

Partial coverage: the score is based on 95% of applicable check weight. 1 unverified check(s) are excluded, not counted as failures.

2026-11-15 18:19 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 security25/25

Good83% coverage

Spoofing email from this domain is hard.

Encryption & certificate25/25

Good

Traffic to the site is encrypted and the certificate is valid.

Browser protections19/30

Needs attention

Some browser protections are missing.

DNS infrastructure15/15

Good

The domain's infrastructure is well hardened.

Help someone else check their domain

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

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What to do first

1.
Limit what scripts your pages are allowed to run
This adds one layer of protection against injected scripts.
Who can fix it: Your website developer or web host
How to verify after the fix
```
curl -sIL https://slack.com/ | grep -i "Content-Security-Policy-Report-Only"
```
2.
Stop browsers from guessing file types
This removes one way a file could be treated as something it is not.
Who can fix it: Your website developer or web host
How to verify after the fix
```
curl -sIL https://slack.com/ | grep -i "X-Content-Type-Options"
```

A starting point, not a security guarantee.

What this grade means

Tested hostname: slack.com
Website request: GET https://slack.com/
Scan time: 2026-11-15 18:19:06 UTC
Grading method: Version 2How grading works
Unverified or excluded checks: DKIM — digital signature on email · Not detected (common selectors only)

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 slack.com 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 18:19:06 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/slack.com.svg)](https://getmirror.online/report/slack.com)

HTML

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

Badge URL

https://getmirror.online/badge/slack.com.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

B88/10011/15/26, 06:19 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

25/25

Encryption & certificate

25/25

Browser protections

19/30

DNS infrastructure

15/15

Public DNS records

A	slack.com	52.89.90.67 54.70.179.16 54.71.95.193 54.188.33.22 54.245.50.245 35.81.85.251 35.82.91.193 44.234.235.93 44.237.180.172
AAAA	slack.com	—
MX	slack.com	1 aspmx.l.google.com 5 alt1.aspmx.l.google.com 5 alt2.aspmx.l.google.com 10 aspmx2.googlemail.com 10 aspmx3.googlemail.com
NS	slack.com	ns-166.awsdns-20.com ns-606.awsdns-11.net ns-1493.awsdns-58.org ns-1901.awsdns-45.co.uk
TXT	slack.com	OSSRH-54733 _0vidyxobp6x350odqhb4fo7fdxhmtq3 spycloud-domain-verification=02e4c0be-cf43-44e4-beaf-4f99702ca632 google-site-verification=2PK67oVPNyEtS1avSlr3PhH5nSiFuticbQv_bT4pM2k google-site-verification=KqX3Ngw0XEjz_0GVx_xwFFlCoO-bskhqU_lxv0Q77mk google-site-verification=QvelFPjIOe3Vavw0q-aAVYaAPKmWCRjmmVVEAjgfjQc google-site-verification=efuXt5-oMr2CdNmVi6A9IO29KMKifpseD1qokxjWwcE google-site-verification=kB1KvgpSk9YkHsFmsj1VPI5YmDvfKctPxnplhGjyqtE google-site-verification=o2grd1TLmZZ8GrqbhVIFtzO2MRLTtSUpBBIBYfhQVCQ google-site-verification=v-LLB__IhraaI7ZzuE3jvRFIm2vERPLzWoepAEZJtKQ hubspot-developer-verification=OTE4NzYxYTgtMDUwZi00MzgzLTk2YTUtZDAwNjBlODg1MWM0 v=spf1 include:_spf.qualtrics.com include:mail.zendesk.com include:_spfextra.slack.com -all
TXT	_dmarc.slack.com	v=DMARC1;p=reject;fo=1:d:s;pct=100;rua=mailto:dmarc_agg@vali.email,mailto:0e5a5c34@inbox.ondmarc.com;ruf=mailto:0e5a5c34@inbox.ondmarc.com
CAA	slack.com	0 iodef "mailto:hostmaster@slack-corp.com" 0 issue "amazon.com" 0 issue "digicert.com; account=455b15ed272bed097725c6ea50e89921fc57379c5338a29305c05771df65fff1" 0 issue "letsencrypt.org; accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1532134906"
DS	slack.com	296 13 2 601d7ec07e7dee6e1ab6a3e5b2da170f8353375fea63af2b732faa5a22898ea0

Fix priorities

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

1MediumCSP — protection from script injectionHardening gap+5
2LowX-Content-Type-OptionsHardening gap+4
3LowPermissions-PolicyHardening gap+2

To verify

Couldn't be confirmed from public data, so excluded from the score. Checking them clarifies your posture; it doesn't guarantee a score change.

DKIM — digital signature on email

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 rulesIncomplete evidence · 1 unverified
SPF, DKIM and DMARC are required for bulk senders to Gmail and Yahoo; missing them risks rejected or spam-foldered mail.
PCI DSS v4.01 observed gaps
TLS, certificate and browser-header protections relate to PCI DSS v4.0 requirements 4.2 and 6.4 for payment pages.
CSP — protection from script injection
NIS2 / vendor due diligenceNo gaps observed
Vendor risk reviews under NIS2/DORA and cyber-insurance questionnaires check these public signals.
SOC 2 / ISO 27001 baseline2 observed gaps
Baseline external hygiene commonly expected in SOC 2 and ISO 27001 audits.
CSP — protection from script injection X-Content-Type-Options

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

slack.com

Good shape, with a few gaps worth closing this quarter.

Partial coverage: the score is based on 95% of applicable check weight. 1 unverified check(s) are excluded, not counted as failures.

2026-11-15 18:19 UTC

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

What to do first

Limit what scripts your pages are allowed to run

This adds one layer of protection against injected scripts.

Who can fix it: Your website developer or web host

How to verify after the fix

curl -sIL https://slack.com/ | grep -i "Content-Security-Policy-Report-Only"

Stop browsers from guessing file types

This removes one way a file could be treated as something it is not.

Who can fix it: Your website developer or web host

How to verify after the fix

curl -sIL https://slack.com/ | grep -i "X-Content-Type-Options"

What this grade means

Tested hostname

slack.com

Website request

GET https://slack.com/

Scan time

2026-11-15 18:19:06 UTC

Grading method

Version 2How grading works

Unverified or excluded checks

DKIM — digital signature on email · Not detected (common selectors only)

Technical detail

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

Email security

25/25

Encryption & certificate

25/25

Browser protections

19/30

DNS infrastructure

15/15

Public DNS records

A	slack.com	52.89.90.67 54.70.179.16 54.71.95.193 54.188.33.22 54.245.50.245 35.81.85.251 35.82.91.193 44.234.235.93 44.237.180.172
AAAA	slack.com	—
MX	slack.com	1 aspmx.l.google.com 5 alt1.aspmx.l.google.com 5 alt2.aspmx.l.google.com 10 aspmx2.googlemail.com 10 aspmx3.googlemail.com
NS	slack.com	ns-166.awsdns-20.com ns-606.awsdns-11.net ns-1493.awsdns-58.org ns-1901.awsdns-45.co.uk
TXT	slack.com	OSSRH-54733 _0vidyxobp6x350odqhb4fo7fdxhmtq3 spycloud-domain-verification=02e4c0be-cf43-44e4-beaf-4f99702ca632 google-site-verification=2PK67oVPNyEtS1avSlr3PhH5nSiFuticbQv_bT4pM2k google-site-verification=KqX3Ngw0XEjz_0GVx_xwFFlCoO-bskhqU_lxv0Q77mk google-site-verification=QvelFPjIOe3Vavw0q-aAVYaAPKmWCRjmmVVEAjgfjQc google-site-verification=efuXt5-oMr2CdNmVi6A9IO29KMKifpseD1qokxjWwcE google-site-verification=kB1KvgpSk9YkHsFmsj1VPI5YmDvfKctPxnplhGjyqtE google-site-verification=o2grd1TLmZZ8GrqbhVIFtzO2MRLTtSUpBBIBYfhQVCQ google-site-verification=v-LLB__IhraaI7ZzuE3jvRFIm2vERPLzWoepAEZJtKQ hubspot-developer-verification=OTE4NzYxYTgtMDUwZi00MzgzLTk2YTUtZDAwNjBlODg1MWM0 v=spf1 include:_spf.qualtrics.com include:mail.zendesk.com include:_spfextra.slack.com -all
TXT	_dmarc.slack.com	v=DMARC1;p=reject;fo=1:d:s;pct=100;rua=mailto:dmarc_agg@vali.email,mailto:0e5a5c34@inbox.ondmarc.com;ruf=mailto:0e5a5c34@inbox.ondmarc.com
CAA	slack.com	0 iodef "mailto:hostmaster@slack-corp.com" 0 issue "amazon.com" 0 issue "digicert.com; account=455b15ed272bed097725c6ea50e89921fc57379c5338a29305c05771df65fff1" 0 issue "letsencrypt.org; accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1532134906"
DS	slack.com	296 13 2 601d7ec07e7dee6e1ab6a3e5b2da170f8353375fea63af2b732faa5a22898ea0

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 rulesIncomplete evidence · 1 unverified

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

PCI DSS v4.01 observed gaps

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

CSP — protection from script injection

NIS2 / vendor due diligenceNo gaps observed

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

SOC 2 / ISO 27001 baseline2 observed gaps

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

CSP — protection from script injection X-Content-Type-Options

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.

slack.com

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

slack.com

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