Location
Columbus, United States
Within about 20 km
Domain
slack.com
Hosted on AWS EC2 in Ohio (us-east-2).
Still looking this up. This tab fills in as the answers arrive.
Network Every network on the internet has an autonomous system number (ASN). This is the one that announces this address.
AS16509Amazon
AWS · EC2 · Ohio
BGP prefixPrefix The block of addresses this IP is announced in to the rest of the internet. RPKI valid means the block's owner signed off on the network announcing it.
RPKI valid3.136.0.0/13
Seen by 3,149 peers
Latency Round trip for an HTTPS request from your browser to the site and back, including the server's reply time.
Live— ms
Measuring from your browser…
At a glance
Route
Finding a probe near you…
Networks crossed
Each network is an autonomous system (AS). Your traffic is handed from one to the next where they connect, following
the routes BGP advertises.
- AS16509Anthropic, PBC
Tracing from a probe near you with Globalping. Hop locations that its round-trip times rule out are left off the map.
DNS records
TypeNameValueTTL
Aslack.com3.142.111.4049 sec
Aslack.com3.143.19.6549 sec
Aslack.com3.143.53.149 sec
Aslack.com18.216.36.19049 sec
Aslack.com18.221.229.8149 sec
Aslack.com3.22.139.17649 sec
Aslack.com3.129.123.23549 sec
Aslack.com3.130.95.18249 sec
Aslack.com3.134.44.13449 sec
NSslack.comns-166.awsdns-20.com1 hr
NSslack.comns-606.awsdns-11.net1 hr
NSslack.comns-1493.awsdns-58.org1 hr
NSslack.comns-1901.awsdns-45.co.uk1 hr
MXslack.com1 aspmx.l.google.com1 min
MXslack.com5 alt1.aspmx.l.google.com1 min
MXslack.com5 alt2.aspmx.l.google.com1 min
MXslack.com10 aspmx2.googlemail.com1 min
MXslack.com10 aspmx3.googlemail.com1 min
TXTslack.com"OSSRH-54733"1 hr
TXTslack.com"_0vidyxobp6x350odqhb4fo7fdxhmtq3"1 hr
TXTslack.com"spycloud-domain-verification=02e4c0be-cf43-44e4-beaf-4f99702ca632"1 hr
TXTslack.com"google-site-verification=2PK67oVPNyEtS1avSlr3PhH5nSiFuticbQv_bT4pM2k"1 hr
TXTslack.com"google-site-verification=KqX3Ngw0XEjz_0GVx_xwFFlCoO-bskhqU_lxv0Q77mk"1 hr
TXTslack.com"google-site-verification=QvelFPjIOe3Vavw0q-aAVYaAPKmWCRjmmVVEAjgfjQc"1 hr
TXTslack.com"google-site-verification=efuXt5-oMr2CdNmVi6A9IO29KMKifpseD1qokxjWwcE"1 hr
TXTslack.com"google-site-verification=kB1KvgpSk9YkHsFmsj1VPI5YmDvfKctPxnplhGjyqtE"1 hr
TXTslack.com"google-site-verification=o2grd1TLmZZ8GrqbhVIFtzO2MRLTtSUpBBIBYfhQVCQ"1 hr
TXTslack.com"google-site-verification=v-LLB__IhraaI7ZzuE3jvRFIm2vERPLzWoepAEZJtKQ"1 hr
TXTslack.com"hubspot-developer-verification=OTE4NzYxYTgtMDUwZi00MzgzLTk2YTUtZDAwNjBlODg1MWM0"1 hr
TXTslack.com"v=spf1 include:_spf.qualtrics.com include:mail.zendesk.com include:_spfextra.slack.com -all"1 hr
TXT_dmarc.reject100.salesforce.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"1 hr
CAAslack.com0 iodef "mailto:hostmaster@slack-corp.com"5 min
CAAslack.com0 issue "digicert.com; account=455b15ed272bed097725c6ea50e89921fc57379c5338a29305c05771df65fff1"5 min
CAAslack.com0 issue "letsencrypt.org; accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1532134906"5 min
DSslack.com296 13 2 601d7ec07e7dee6e1ab6a3e5b2da170f8353375fea63af2b732faa5a22898ea021 hr
Protected from spoofing
Mail that fails its checks is rejected under slack.com's DMARC policy, so forged mail doesn't reach inboxes.
- Receives mail
- Google Workspace
- Mail servers
- aspmx.l.google.comalt1.aspmx.l.google.comalt2.aspmx.l.google.com+2 more
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Rejects everything else3 of 10 DNS lookups · includes _spf.qualtrics.com, mail.zendesk.com…
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Rejectsends reports
- MTA-STSRequires other mail servers to use encrypted connections (TLS) when delivering to this domain.
- Not published
- TLS reportsAsks other mail servers to report failed encrypted deliveries (TLS-RPT).
- Not requested
- BIMIA brand logo that some mail apps show next to authenticated mail from the domain.
- Not published
Exposure
Open ports
2 open- 80HTTP
- 443HTTPS
- Software
- Elastic Load Balancing
- Tags
- Cloud
- Seen asHostnames Shodan has seen pointing at, or presented by, this address.
- ec2-3-142-111-40.us-east-2.compute.amazonaws.com
From Shodan InternetDB, updated weekly.
Website
Page
Slack | AI Work Platform & Productivity Tools
Boost productivity and save time with Slack — the AI work platform for managing projects, automating workflows, and connecting teams securely. Start working smarter today.
- Language
- American English
Built with
- CloudFrom the provider's published address ranges.
- AWS · EC2 · Ohious-east-2
- Server
- Apacheserver header “Apache”
Details
Network
- IPv4
- 3.142.111.40
- Reverse DNSThe hostname this address points back to (its PTR record).
- ec2-3-142-111-40.us-east-2.compute.amazonaws.com
- ASNThe autonomous system number of the network that announces this address.
- AS16509
- Operator
- Amazon.com, Inc.
- HostingFrom the provider's own published list of its address ranges.
- AWS · EC2Ohio (us-east-2)
- PrefixThe block of addresses announced over BGP that contains this address.
- 3.136.0.0/13
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,149 peers
- Type
- Content
- Registry
- ARIN
Location
- Country
- United States
- Region
- Ohio
- City
- Columbus
- Coordinates
- 39.9587° N, 82.9987° W
- Accuracy
- Within about 20 km
- Time zone
- America/New_YorkUTC-4
- Local time
- 12:04
- Continent
- North America
Registration
RDAP- PopularityCloudflare Radar's ranking of domains by how often 1.1.1.1 users look them up.
- Top 500
- Registrar
- MarkMonitor Inc.
- Registered
- Oct 21, 199233 years ago
- Expires
- Oct 20, 2027next year
- Updated
- Sep 18, 2025
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Delete lockedTransfer lockedUpdate lockedDelete locked by registryTransfer locked by registryUpdate locked by registry
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Signed
- Name servers
- ns-1493.awsdns-58.orgns-166.awsdns-20.comns-1901.awsdns-45.co.ukns-606.awsdns-11.net
- Registrant
- Redacted for privacy
Oct 21, 1992373 days leftOct 20, 2027
Tech stack
Built with Each entry says what gave it away: a response header, a cookie's name, an asset's path or file name, or markup the tool leaves in the page. Versions are checked against endoflife.date's support schedules and, for JavaScript packages, OSV's vulnerability database, which carries GitHub's security advisories.
Hosting
- AWS · EC2 · Ohious-east-2
AWS address range
Server
- Apache HTTP Server
server header “Apache”
- Envoy
x-envoy-upstream-service-time header
How it's made
- RenderingPrerendered pages are built ahead of time and served as files. Pages rendered on each request are built by server code for every visitor. Pages drawn in the browser arrive nearly empty and depend on JavaScript, which most AI crawlers don't run. Islands are interactive parts in otherwise static HTML.
- Complete HTML2,113 words before any script runs
- HTML
- 248.0 KB · sent Brotli-compressed
- Scripts
- 17 files · 13 inline17 from other sites
- Render-blockingPlain scripts in the page's head, without async, defer or type=module. The browser shows nothing until each one has downloaded and run.
- 4 scripts
Code from other sites Scripts a page loads from another domain run with the same power as its own code: they can read what visitors type and change the page. heade.rs checks what the HTML loads, not what tag managers add once they run.
- Consent
- OneTrust
- Integrity checksSubresource Integrity: the script tag carries a hash of the file, so the browser refuses it if the other site changes it. Analytics and tag manager scripts change by design and can't carry one; pinned library files can.
- 0 of 17 scripts
HTTPS
Certificate
Valid- Issuer
- Let's Encrypt
- Issuing CA
- YR2
- Covers
- *.slack.com, slack.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 1 more certificate
Oct 7, 202685 days leftJan 5, 2027
From Certificate Transparency logs, via Cert Spotter.
Security
C- HSTSStrict-Transport-Security makes browsers refuse plain HTTP to this site. Preloaded sites are HTTPS-only even on a first visit.
- 1 year · with subdomainsRemoved from preload
- HTTP → HTTPSWhether the plain http:// address redirects visitors to the secure one.
- Redirects
- HTTP/3The newest HTTP, over QUIC. Announced in the alt-svc header or the domain's HTTPS DNS record.
- Available
- CAADNS records naming the only certificate authorities allowed to issue certificates for the domain.
- DigiCert, Let's Encrypt
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- https://hackerone.com/slack/
Security headers 4 of 7
- HSTSpresent
- CSPmissing
- Framingpresent
- No sniffingmissing
- Referrerpresent
- Permissionsmissing
- Isolationpresent
Response
200 OK186 ms from CMH · 25.9 KBDNS lookup2 ms
200 slack.com186 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Response headers
- date
- Mon, 12 Oct 2026 16:04:32 GMT
- server
- Apache
- vary
- Accept-Encoding
- x-xss-protection
- 0
- content-type
- text/html; charset=utf-8
- cross-origin-opener-policy
- same-origin
- strict-transport-security
- max-age=31536000; includeSubDomains; preload
- referrer-policy
- no-referrer
- x-slack-unique-id
- 39e05546-2c4d-404a-8ad6-73408f797c62
- x-frame-options
- SAMEORIGIN
- set-cookie
- utm=%7B%7D; expires=Mon, 26-Oct-2026 16:04:32 GMT; Max-Age=1209600; path=/; domain=.slack.com; secure; SameSite=None
- set-cookie
- b=37e147d60cf7f68d3b4a92511ef795bd; expires=Sun, 12-Oct-2036 16:04:32 GMT; Max-Age=315619200; path=/; domain=.slack.com; secure; SameSite=None
- set-cookie
- x=37e147d60cf7f68d3b4a92511ef795bd.1791821072; expires=Mon, 12-Oct-2026 16:19:32 GMT; Max-Age=900; path=/; domain=.slack.com; secure; SameSite=None
- set-cookie
ui=%7B%22v%22%3A1%2C%22sid%22%3A%2237e147d60cf7f68d3b4a92511ef795bd.1791821072%22%2C%22st%22%3A1791821072%2C%22pc%22%3A1%2C%22qs%22%3A%22%22%2C%22ref%22%3A%22%22%2C%22ii%22%3A19%2C%22ci%22%3A19%2C%22fs%22%3A0%2C%22tags%22%3A%5B19%5D%2C%22tc… Show all
ui=%7B%22v%22%3A1%2C%22sid%22%3A%2237e147d60cf7f68d3b4a92511ef795bd.1791821072%22%2C%22st%22%3A1791821072%2C%22pc%22%3A1%2C%22qs%22%3A%22%22%2C%22ref%22%3A%22%22%2C%22ii%22%3A19%2C%22ci%22%3A19%2C%22fs%22%3A0%2C%22tags%22%3A%5B19%5D%2C%22tc%22%3A%7B%2219%22%3A100%7D%2C%22vp%22%3A%5B%7B%22u%22%3A%22%5C%2F%22%2C%22t%22%3A1791821072%2C%22g%22%3A%5B19%5D%7D%5D%2C%22sn%22%3A%5B%7B%22u%22%3A%22%5C%2Ffeatures%22%2C%22r%22%3Anull%2C%22p%22%3A1%2C%22v%22%3A0%7D%2C%7B%22u%22%3A%22%5C%2Fwhat-is-slack%22%2C%22r%22%3Anull%2C%22p%22%3A2%2C%22v%22%3A0%7D%2C%7B%22u%22%3A%22%5C%2Fcustomer-stories%22%2C%22r%22%3Anull%2C%22p%22%3A3%2C%22v%22%3A0%7D%5D%2C%22f1%22%3Anull%2C%22prev%22%3Anull%2C%22fsa%22%3A1791821072%2C%22ts%22%3A1%2C%22tpv%22%3A1%2C%22cp%22%3Anull%7D; expires=Tue, 12-Oct-2027 16:04:32 GMT; Max-Age=31536000; path=/; domain=.slack.com; secure; httponly; SameSite=Lax- via
- 1.1 slack-prod.tinyspeck.com, ingress-www-iad-external-prod-024274d82f538d6fc,ingress-edge-cmh-prod-08f48db1dd9ca8a16
- content-encoding
- br
- content-length
- 26553
- x-envoy-upstream-service-time
- 102
- x-backend
- main_normal
- x-server
- slack-www-hhvm-main-iad-wnjfk4aqsye8
- x-slack-shared-secret-outcome
- no-match
- x-edge-backend
- envoy-www
- timing-allow-origin
- *
- alt-svc
- h3=":443"; ma=2592000, h3-29=":443"; ma=2592000, quic=":443"; ma=2592000
- x-slack-edge-shared-secret-outcome
- no-match
- connection
- close
AI & agents
Open to AI crawlers
robots.txt lets every AI crawler in.
Crawlers
Allows allTrainingSearchOn request
They visit a page when someone asks an assistant about it. ChatGPT's, Perplexity's, Meta's and Amazon's treat robots.txt as advisory;
Anthropic's and Mistral's follow it.
OpenAIGPTBotallowedOAI-SearchBotallowedChatGPT-Userallowed
AnthropicClaudeBotallowedClaude-SearchBotallowedClaude-Userallowed
GoogleGoogle-ExtendedallowedGooglebotallowed—
Microsoft—bingbotallowed—
AppleApplebot-ExtendedallowedApplebotallowed—
Perplexity—PerplexityBotallowedPerplexity-Userallowed
MetaMeta-ExternalAgentallowedMeta-WebIndexerallowedMeta-ExternalFetcherallowed
AmazonAmazonbotallowedAmzn-SearchBotallowedAmzn-Userallowed
MistralMistralAI-TrainingallowedMistralAI-IndexallowedMistralAI-Userallowed
OthersCCBotallowedBytespiderallowedDuckAssistBotallowed
- Can cite itThe AI products that can use the site in their answers: each answers from one crawler (OAI-SearchBot for ChatGPT search, Googlebot for AI Overviews, bingbot for Copilot), and robots directives on the front page, like noindex, nosnippet and noarchive, keep some out.
- ChatGPT searchClaudePerplexityAI OverviewsGeminiCopilotMeta AISiri
Reading
- Without JavaScriptText on the front page before any scripts run: what GPTBot, ClaudeBot, PerplexityBot and most agents read. Google, Bing and Apple's crawlers run scripts.
- 2,113 words
- MarkdownAgents like Claude Code, Cursor and OpenCode ask for Markdown in their Accept header. It's the page without its markup, so it costs them far fewer tokens.
- Not offered
- llms.txtA Markdown file listing a site's key pages for AI tools. Coding agents read it; search crawlers mostly don't.
- 165 links in 7 sections
- Structured dataschema.org JSON-LD in the page: facts about the site in a form machines read directly.
- None on the front page
Tools Ways an AI agent can do things on the site, not just read it: an MCP server that apps like Claude, ChatGPT and Cursor connect to, an API catalog, packaged agent skills, a shopping profile (UCP), or tools the page offers AI in the browser (WebMCP). heade.rs looks in the official MCP Registry and the files the site publishes under /.well-known/.
No MCP server, API catalog, agent skills, shopping profile or in-page tools found.