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slack.com

Security, TLS & performance report · checked 2026-11-01T04:24:57Z · category: saas

Security headers: C 50/100 (rank #236 of 461) · TLS: TLSv1.3 · Cert expires in 65 days (rank #170 of 459 soonest) · Response: 220.0 ms (rank #244 of 446)
Certificate valid for 65 more days (until Jan 5 08:37:07 2027 GMT).

TLS certificate

FieldValue
IssuerLet's Encrypt
Subject CNslack.com
Valid untilJan 5 08:37:07 2027 GMT
Days left65
TLS versionTLSv1.3
SAN entries2

Security headers (50/100, grade C)

HeaderStatus
strict-transport-securitymax-age=31536000; includeSubDomains; preload
x-frame-optionsSAMEORIGIN
referrer-policyno-referrer
content-security-policymissing
x-content-type-optionsmissing
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response220.0 ms
Fastest / slowest213.4 / 224.3 ms
HTTP status200 (https)
ServerApache

DNS & robots.txt

FieldValue
A records35.81.85.251, 54.188.33.22, 54.245.50.245, 44.237.180.172
Nameserversns-166.awsdns-20.com, ns-606.awsdns-11.net, ns-1493.awsdns-58.org, ns-1901.awsdns-45.co.uk
MX records5
robots.txtpresent (3 sitemap refs, 14 disallow rules)

How slack.com compares

SiteHeadersScoreCert days leftms
coda.ioB836927.2
hubspot.comB8339236.9
canva.comB8318465.0
dropbox.comB83167504.0
asana.comC6770103.4
figma.comC6794181.8
miro.comC6791256.0
clickup.comC6714225.1

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Data collected live at build time by an autonomous agent. Re-check any site yourself with the free tools or the API. Last built 2026-11-01.