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https://isweb.co.kr

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
0
REVIEW
2
PASS
7
INFO
0
Probed from Madrid, Spain
403 Forbidden
Checks
9
7 PASS 2 REVIEW
B
TLS Certificate Expiry & Recommendations
324 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

324
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • 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
B
CDN & Delivery
Cloudflare
REVIEW
Cloudflare
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: 9f07675c4bc5d0ba-CDG
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9f07675c4bc5d0ba-CDG
A
DNS Records
2 A records, 307 ms lookup
PASS
2 A records, 307 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.20.31.159, 172.66.173.30
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:10::ac42:ad1e, 2606:4700:10::6814:1f9f
Info::
2 nameserver(s) configured
Got: chris.ns.cloudflare.com, jocelyn.ns.cloudflare.com
Info::
5 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Warning::
DNS resolution is slow (307 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 307 ms
A104.20.31.159, 172.66.173.30
AAAA2606:4700:10::ac42:ad1e, 2606:4700:10::6814:1f9f
CNAME
NSchris.ns.cloudflare.com, jocelyn.ns.cloudflare.com
MX
10 gmail-smtp-in.l.google.com
20 alt1.gmail-smtp-in.l.google.com
30 alt2.gmail-smtp-in.l.google.com
40 alt3.gmail-smtp-in.l.google.com
50 alt4.gmail-smtp-in.l.google.com
TXT
SPF v=spf1 ip4:211.252.85.56 include:_spf.google.com ~all
google-site-verification=y1L7-FKlGa_wkUMSWUPDJcyphtL78uDgI7DOboUcplw
worksmobile.certification.taysji8toqky2kgb4v.vnlyzldgvcmohc.6pfmaobrw
CAALookup not available with standard resolver
Resolved in 307 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

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.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A+
Redirect Chain
0 redirect(s), 61 ms total
PASS
0 redirect(s), 61 ms total

https://isweb.co.kr

61 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://isweb.co.kr40361 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (16 ms)
PASS
IPv6 reachable (16 ms)
Info::
IPv6 is configured and reachable at 2606:4700:10::ac42:ad1e, 2606:4700:10::6814:1f9f
Got: 16 ms connect
IPv6 Ready
AAAA Records 2606:4700:10::ac42:ad1e, 2606:4700:10::6814:1f9f Connection Reachable (16 ms)
A+
Crawlability
robots.txt present, sitemap with 36 URLs
PASS
robots.txt present, sitemap with 36 URLs
Info::
robots.txt is present
Got: 1763 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 36 entries
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 1763 B Sitemaps referenced 0 User-agents CCBot, CloudflareBrowserRenderingCrawler, GPTBot, meta-externalagent, Amazonbot, Applebot-Extended, Bytespider, ClaudeBot, Google-Extended, * Blocking No — crawling allowed
# As a condition of accessing this website, you agree to abide by the following
# content signals:

# (a)  If a Content-Signal = yes, you may collect content for the corresponding
#      use.
# (b)  If a Content-Signal = no, you may not collect content for the
#      corresponding use.
# (c)  If the website operator does not include a Content-Signal for a
#      corresponding use, the website operator neither grants nor restricts
#      permission via Content-Signal with respect to the corresponding use.

# The content signals and their meanings are:

# search:   building a search index and providing search results (e.g., returning
#           hyperlinks and short excerpts from your website's contents). Search does not
#           include providing AI-generated search summaries.
# ai-input: inputting content into one or more AI models (e.g., retrieval
#           augmented generation, grounding, or other real-time taking of content for
#           generative AI search answers).
# ai-train: training or fine-tuning AI models.

# ANY RESTRICTIONS EXPRESSED VIA CONTENT SIGNALS ARE EXPRESS RESERVATIONS OF
# RIGHTS UNDER ARTICLE 4 OF THE EUROPEAN UNION DIRECTIVE 2019/790 ON COPYRIGHT
# AND RELATED RIGHTS IN THE DIGITAL SINGLE MARKET.

# BEGIN Cloudflare Managed content

User-agent: *
Content-Signal: search=yes,ai-train=no
Allow: /

User-agent: Amazonbot
Disallow: /

User-agent: Applebot-Extended
Disallow: /

User-agent: Bytespider
Disallow: /

User-agent: CCBot
Disallow: /

User-agent: ClaudeBot
Disallow: /

User-agent: CloudflareBrowserRenderingCrawler
Disallow: /

User-agent: Google-Extended
Disallow: /

User-agent: GPTBot
Disallow: /

User-agent: meta-externalagent
Disallow: /

# END Cloudflare Managed Content

User-agent: *

Allow: /


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

403https://www.isweb.co.kr/
200https://isweb.co.kr/

HTTP → HTTPS

301http://isweb.co.kr/ https://isweb.co.kr/

Consistent

A+
Domain Intelligence
isweb.co.kr — via Megazone(http://HOSTING.KR)
PASS
isweb.co.kr — via Megazone(http://HOSTING.KR)
Info::
Registrar: Megazone(http://HOSTING.KR)
Info::
Registrar lock is enabled
Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.
Domain expiry

Unknown

SSL certificate

324 days

Issued by GoGetSSL

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2606:4700:10::6814:1f9f

Registrar

Megazone(http://HOSTING.KR)

Locked 2 NS records
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Registrar Megazone(http://HOSTING.KR)
Name Servers chris.ns.cloudflare.com, jocelyn.ns.cloudflare.com
Hosting
IP Address 2606:4700:10::6814:1f9f
Data source: whois (1.3s)

Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.

Why this matters

Registrar lock (clientTransferProhibited et al.) prevents unauthorized domain transfers — strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 90 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
31 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
17 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
22 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
90 ms
Total Time Total request time from DNS lookup through full response.
90 ms

Connection waterfall

DNS Lookup 31 ms TCP Connect 17 ms TLS Handshake 22 ms Server Processing 20 ms Content Transfer 0 ms
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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