Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BTLS Certificate Expiry & Recommendations88 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
ADNS Records4 A records, 588 ms lookupPASS
| A | 151.101.66.132, 151.101.2.132, 151.101.130.132, 151.101.194.132 |
| AAAA | — |
| CNAME | — |
| NS | ns-1013.awsdns-62.net, ns-1360.awsdns-42.org, ns-1758.awsdns-27.co.uk, ns-91.awsdns-11.com |
| MX | 10 aspmx.l.google.com 20 alt2.aspmx.l.google.com 20 alt1.aspmx.l.google.com 30 aspmx3.googlemail.com 30 aspmx2.googlemail.com |
| TXT | apple-domain-verification=K9xP4O3Kf2AWcoL6 atlassian-domain-verification=nLNEa/3YX8+FCe4Er7wL2BjSgjDkzeS+Y1dJzIFh48F9oPFFyg... cursor-domain-verification-4sk5a7=XY3UPRnnlpUU8idlDUHZfVnqQ docusign=c677b60e-d213-4c83-a2ea-8939ce46d114 google-site-verification=MZDqZ6YFs43PB8rFIrsEMeH7FF16FBHS7PqB_-xfoxQ google-site-verification=S8eMmX7gV97qABWx7R0eRpfzLXwdY895N-ABXbm758Y google-site-verification=VoTcCzdSA8qmNbg_CumbTrAGczCGq5f9LNjUgHctqzQ google-site-verification=k83L0vAR4o6gacvlkNSG70uIH33Ttvwk04eVOS7GNLs google-site-verification=xY5EWpfbSLTv9INagfm7yl91CQS9rqTmtcWDzdeh9ZI google-site-verification=xjx-CPcKxDmi1Qig1JfFEUGeuyooOI9h02nFPbgkAno mixpanel-domain-verify=c40ce2af-3965-4146-8049-0b625a81b9b1 openai-domain-verification=dv-HYfddEsOazWpFcmjumrDkUwC pardot_310041_*=1a0e9130a62c8fc831730aa8eecf70bee4ac763f893720f4c46998895a4c321c pendo-domain-verification=1675bc1d-73c0-4353-bca0-c34afcb40655 rippling-domain-verification=d1abfa491591ff04 segment-site-verification=aKyxVCIqlVI3Dcjuca7fXJYvglTcLO9E v=DMARC1; p=none; pct=100; fo=1; ri=3600; rua=mailto:f8e8d229@inbox.ondmarc.com,... SPF v=spf1 include:_spf.google.com include:sendgrid.net include:mail.zendesk.com inc... |
| CAA | Lookup not available with standard resolver |
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
Slow DNS adds latency to every page load. Consider a faster DNS provider.
DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.
Source: DNS performance benchmarks
A+Redirect ChainNo redirects — direct accessPASS
https://foursquare.com
108 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://foursquare.com | 200 | 108 ms | HTTP/1.1 | nginx |
A+Crawlabilityrobots.txt present, sitemap with 1 URLsPASS
User-agent: *
Disallow: /search
Disallow: /search?
Disallow: /login?
Disallow: /login/*
Disallow: /signup?
Disallow: /signup/*
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php
Allow: /signup/$
Disallow: /mobile/
Disallow: /touch/login
Disallow: /mobile/search
Disallow: /user/*/checkin/
Disallow: /*/checkin/
Allow: /v/checkin*
Disallow: /private/wtrack
Disallow: /l/
Disallow: /*/badge/
Disallow: /*/badges
Allow: /v/badge*
Disallow: /oauth2/
Disallow: /device/
Disallow: /venue/claim
Disallow: /app/
Disallow: /go/
Disallow: /*/lists/edited$
Disallow: /*/lists/followed$
Disallow: /*/lists/friends$
Disallow: /*/list/todos$
Disallow: /*/list/tips$
Disallow: /*/list/venuelikes$
User-agent: Branch Metrics API
User-agent: Branch API
Allow: /v/*
User-agent: PiplBot
User-agent: MJ12bot
User-agent: CCBot
User-agent: SeznamBot
User-agent: Exabot
User-agent: netseer
User-agent: Mappy
User-agent: crawler4j
User-agent: Gigabot
User-agent: ZoomBot
User-agent: BUbiNG
User-agent: Getintent Crawler
User-agent: BLEXBot
User-Agent: trendictionbot
User-agent: hyscore
User-agent: magpie-crawler
User-agent: RyteBot
Disallow: /v/*
User-agent: GPTBot
User-agent: ChatGPT-User
Disallow: /
Sitemap: https://4sq-sitemap.s3.amazonaws.com/sitemap_index.xml
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencefoursquare.com — via Gandi SAS, 24 years, 5 months old, hosted on FastlyPASS
283 days
March 26, 2027
88 days
Issued by Let's Encrypt
24 years, 5 months
Registered March 26, 2002
Not enabled
Protects against DNS spoofing
Fastly
ASN AS54113
151.101.66.132
Gandi SAS
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice