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Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
93
GRADE
A
FIX
2
REVIEW
3
PASS
12
INFO
0
Probed from New York, United Stated
200 OK
Checks
17
12 PASS 3 REVIEW 2 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2001:470:1f07:6fe::1
Info::
IPv6 connection error
Got: dial tcp6 [2001:470:1f07:6fe::1]:443: connect: no route to host
IPv6 Misconfigured
AAAA Records 2001:470:1f07:6fe::1 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

B
TLS Certificate Expiry & Recommendations
80 days until leaf cert expires — 1 issues to address
REVIEW

Certificate validity

80
days left
0d 30d 60d 90d+

Recommended actions

  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
B
CDN Cache Observability
No CDN cache-status headers in the response
REVIEW
No CDN cache-status headers in the response
Info::
No CDN cache-status headers in the response
Without an X-Cache / CF-Cache-Status / X-Vercel-Cache / Age header, you can't tell from outside whether a request hit the cache or went to origin. Operationally important: enables debugging stale-content reports and verifying cache rules. Most managed CDN platforms emit at least one of these by default; absence often means the platform's diagnostic headers are stripped at an upstream proxy.
B
Operational Status Page
No status page link detected
REVIEW
No status page link detected
Info::
No operational status page link detected
Status pages communicate planned maintenance and incidents to users -- a hallmark of operationally-mature services. Most SaaS teams publish one via Atlassian Statuspage, Instatus, BetterUptime, or a self-hosted Cachet. Smaller sites legitimately don't need one; flagged as Info, not a failure.
A+
DNS Records
1 A records, 93 ms lookup
PASS
1 A records, 93 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 23.94.65.218
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 2001:470:1f07:6fe::1
Info::
2 nameserver(s) configured
Got: coco.bunny.net, kiki.bunny.net
Info::
2 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 93 ms
Got: 93 ms
A23.94.65.218
AAAA2001:470:1f07:6fe::1
CNAME—
NScoco.bunny.net, kiki.bunny.net
MX
10 witcher.mxrouting.net
20 witcher-relay.mxrouting.net
TXT
MS=ms22955481
v=DMARC1; p=none
google-site-verification=eySrj7tImhjLmyEzhvz6-esuzD2jdnQ8anx4qfIwApw
SPF v=spf1 include:mxlogin.com include:spf.ahasend.com include:ap.rp.oracleemaildeli...
CAALookup not available with standard resolver
Resolved in 93 ms

Multiple A records provide failover if one server goes down.

Why this matters

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

A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A+
DNSSEC
Signed and validating
PASS
Signed and validating
Info::
DNSSEC fully signed and chain validates (ECDSAP256SHA256)
A+
CAA Records
issue: letsencrypt.org, pki.goog, sectigo.com | issuewild: letsencrypt.org, pki.goog, sectigo.com | iodef configured
PASS
issue: letsencrypt.org, pki.goog, sectigo.com | issuewild: letsencrypt.org, pki.goog, sectigo.com | iodef configured
Info::
CAA issue tag present — authorized CA(s): letsencrypt.org, pki.goog, sectigo.com
Info::
CAA iodef tag present (failed-issuance notifications enabled)
A+
Reverse DNS
2/2 IPs match cert SAN
PASS
2/2 IPs match cert SAN
Info::
PTR for 23.94.65.218 matches certificate SAN: colocrossing.lantian.pub
Info::
PTR for 2001:470:1f07:6fe::1 matches certificate SAN: colocrossing.lantian.pub
A+
Multi-Resolver DNS Speed
Mean 7ms across 3 resolvers (spread 14ms)
PASS
Mean 7ms across 3 resolvers (spread 14ms)
Info::
Cloudflare: 2ms
Got: 2ms via 1.1.1.1:53
Info::
Quad9: 4ms
Got: 4ms via 9.9.9.9:53
Info::
Google: 16ms
Got: 16ms via 8.8.8.8:53
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://lantian.pub

https://lantian.pub

67 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://lantian.pub20067 msHTTP/1.1lantian/colocrossing
A+
Crawlability
robots.txt present, sitemap with 1 URLs
PASS
robots.txt present, sitemap with 1 URLs
Info::
robots.txt is present
Got: 64 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1 entries
Info::
Sitemap index with 1 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 64 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /

Sitemap: https://lantian.pub/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 1 entries Valid XML Yes
Child Sitemaps:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

307https://www.lantian.pub/
200https://lantian.pub/

HTTP → HTTPS

301http://lantian.pub/ → https://lantian.pub/

Consistent

A+
Domain Intelligence
lantian.pub — via Porkbun LLC, 9 years, 10 months old
PASS
lantian.pub — via Porkbun LLC, 9 years, 10 months old
Info::
Domain registered until Oct 23, 2034 (8 years, 4 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: Porkbun LLC
Warning::
Registrar lock is NOT enabled
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.
Domain expiry

3011 days

October 23, 2034

SSL certificate

80 days

Issued by ZeroSSL GmbH

Domain age

9 years, 10 months

Registered October 23, 2016

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2001:470:1f07:6fe::1

Registrar

Porkbun LLC

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Porkbun LLC
Created October 23, 2016 (9 years, 10 months ago)
Expires October 23, 2034 (8 years, 4 months)
Last Updated July 14, 2026
Name Servers kiki.bunny.net, coco.bunny.net
DNSSEC Enabled
Hosting
IP Address 2001:470:1f07:6fe::1
Data source: rdap (0.2s)

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.

Why this matters

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

A+
HTTP Probe Timing
Total 65 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
11 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
12 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
25 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
62 ms
Total Time Total request time from DNS lookup through full response.
65 ms

Connection waterfall

DNS Lookup 11 ms TCP Connect 12 ms TLS Handshake 25 ms Server Processing 13 ms Content Transfer 4 ms
A+
Health Check Endpoint
Health endpoint at https://lantian.pub/status (HTTP 200)
PASS
Health endpoint at https://lantian.pub/status (HTTP 200)
Info::
Public health endpoint at https://lantian.pub/status
Got: https://lantian.pub/status
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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