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
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations83 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
BCDN & DeliveryCloudflare (BYPASS)REVIEW
A+DNS Records1 A records, 46 ms lookupPASS
| A | 198.202.211.1 |
| AAAA | — |
| CNAME | — |
| NS | ns-261.awsdns-32.com, ns-1522.awsdns-62.org, ns-2026.awsdns-61.co.uk, ns-828.awsdns-39.net |
| MX | 0 classlink-com.mail.protection.outlook.com |
| TXT | apple-domain-verification=YkDFx5z01YEISXVD anthropic-domain-verification-xjj7xz=iR7ykRURIR8m1TufjvHBSTscf Foxit-domain-verification=61cb92e4e7446ae2c9505ca5a853b955 linear-domain-verification=c5ruhesasc9j logmein-verification-code=ce6036fe-d2c1-4676-980a-953230408dae p344lhnhr36vrk6csonrdjkmc1 google-site-verification=6rOpTcmbg9b4Cft2EHJWjRuWQJulhd0NmWpjFTaNBUw atlassian-domain-verification=Umlva1cUR4QjS03+6saVBhzTV4/ulItYeC+NDmsly/D9JzcbaE... google-site-verification=zwbqDXH-crJlGAYdIYG5fl9FdRzglZHal9MYPeR_klM qbovvtand4i23tcrc8nuptig5g 9vu5elj96pu6pob1ecp4j5c5dd SPF v=spf1 include:aspmx.pardot.com include:stspg-customer.com include:sendgrid.net ... status-page-domain-verification=rczds3yf1nz9 4qr0lkf6uog34p5a1046dm0tvu 5je1dbqftgftqf2sapptb20988 openai-domain-verification=dv-ed2walzHKaS2my4YbufodW2X |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
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.
ARedirect Chain1 redirect(s), 370 ms totalPASS
https://classlink.com
269 ms · HTTP/1.1
https://www.classlink.com/
101 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://classlink.com | 301 | 269 ms | HTTP/1.1 | cloudflare |
| 2 | https://www.classlink.com/ | 200 | 101 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 1280 URLsPASS
Sitemap: https://www.classlink.com/sitemap.xml
A+Domain Intelligenceclasslink.com — via Amazon Registrar, Inc., 28 years, 7 months old, hosted on CloudflarePASS
229 days
January 29, 2027
83 days
Issued by Google Trust Services
28 years, 7 months
Registered January 30, 1998
Not enabled
Protects against DNS spoofing
Cloudflare
ASN AS209242
198.202.211.1
Amazon Registrar, Inc.
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