Skip to content
https://calameo.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Singapore, Singapore
302 Found
Checks
9
4 PASS 4 REVIEW 1 FIX
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
Redirect Chain
1 redirect(s), 1800 ms total
REVIEW
1 redirect(s), 1800 ms total
Info::
Single redirect
Got: https://calameo.com → https://www.calameo.com/ (302)
Info::
WWW normalization redirect
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://calameo.com
Warning::
Redirect overhead: 1800 ms total
Got: 1800 ms

https://calameo.com

920 ms · HTTP/1.1

302

https://www.calameo.com/

880 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://calameo.com302920 msHTTP/1.1nginx
2https://www.calameo.com/200880 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.

Learn more ▾

Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).

Source: Google Search Central

C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

C
URL Variants
Action
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.calameo.com/
200https://calameo.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

302http://calameo.com/ → https://www.calameo.com/

Use 301 (permanent) instead of 302 (temporary)

B
TLS Certificate Expiry & Recommendations
87 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

87
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
A+
DNS Records
1 A records, 100 ms lookup
PASS
1 A records, 100 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 85.233.202.179
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns-1088.awsdns-08.org, ns-1590.awsdns-06.co.uk, ns-192.awsdns-24.com, ns-897.awsdns-48.net
Info::
1 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
Info::
DNS resolution time: 100 ms
Got: 100 ms
A85.233.202.179
AAAA—
CNAME—
NSns-1088.awsdns-08.org, ns-1590.awsdns-06.co.uk, ns-192.awsdns-24.com, ns-897.awsdns-48.net
MX
0 calameo-com.mail.protection.outlook.com
TXT
MS=ms49205596
W0E0B41705
google-site-verification=gWbPAZmNpksIxIYPK7Dj7_7q4j6sppiYAYuDDRJnks4
google-site-verification=iRSSQKJRqqxHYj0zQK_azZ3-lY0ua7R2wZI7ag237RE
google-site-verification=jXPBinjCn6ho4YRVCMGJhqLC3QM4n2ZH-_4jnTVBJqc
hubspot-developer-verification=MTg3YTcyM2YtNjkxYS00Zjk2LThkNzEtMzNkZDRjOTdlYjk1
SPF v=spf1 a a:calamfr02.calameo.com a:calamfr03.calameo.com a:calamfr04.calameo.com...
CAALookup not available with standard resolver
Resolved in 100 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

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.

A+
Crawlability
robots.txt present, sitemap with 212 URLs
PASS
robots.txt present, sitemap with 212 URLs
Info::
robots.txt is present
Got: 3445 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 212 entries
Info::
Sitemap index with 212 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 3445 B Sitemaps referenced 2 User-agents Amazonbot, Mediapartners-Google, *, Linguee, MJ12bot, facebookexternalhit, Twitterbot, LinkedInBot Blocking No — crawling allowed
User-agent: Linguee
Disallow: /

User-agent: MJ12bot
Disallow: /

User-agent: facebookexternalhit

Disallow: /account$
Disallow: /account/
Disallow: /download$
Disallow: /download/
Disallow: /errors$
Disallow: /errors/
Disallow: /healthcheck$
Disallow: /healthcheck/
Disallow: /oauth$
Disallow: /oauth/
Disallow: /orders$
Disallow: /orders/
Disallow: /profile$
Disallow: /profile/
Disallow: /search$
Disallow: /search/
Disallow: /services$
Disallow: /services/
Disallow: /upload$
Disallow: /upload/
Disallow: /zendesk$
Disallow: /zendesk/
Disallow: /pagegangster$
Disallow: /pagegangster

User-agent: Twitterbot

Disallow: /account$
Disallow: /account/
Disallow: /download$
Disallow: /download/
Disallow: /errors$
Disallow: /errors/
Disallow: /healthcheck$
Disallow: /healthcheck/
Disallow: /oauth$
Disallow: /oauth/
Disallow: /orders$
Disallow: /orders/
Disallow: /profile$
Disallow: /profile/
Disallow: /search$
Disallow: /search/
Disallow: /services$
Disallow: /services/
Disallow: /upload$
Disallow: /upload/
Disallow: /zendesk$
Disallow: /zendesk/
Disallow: /pagegangster$
Disallow: /pagegangster

User-agent: LinkedInBot

Disallow: /account$
Disallow: /account/
Disallow: /download$
Disallow: /download/
Disallow: /errors$
Disallow: /errors/
Disallow: /healthcheck$
Disallow: /healthcheck/
Disallow: /oauth$
Disallow: /oauth/
Disallow: /orders$
Disallow: /orders/
Disallow: /profile$
Disallow: /profile/
Disallow: /search$
Disallow: /search/
Disallow: /services$
Disallow: /services/
Disallow: /upload$
Disallow: /upload/
Disallow: /zendesk$
Disallow: /zendesk/
Disallow: /pagegangster$
Disallow: /pagegangster

User-agent: Amazonbot

Disallow: /account$
Disallow: /account/
Disallow: /books/social$
Disallow: /books/social/
Disallow: /download$
Disallow: /download/
Disallow: /errors$
Disallow: /errors/
Disallow: /healthcheck$
Disallow: /healthcheck/
Disallow: /oauth$
Disallow: /oauth/
Disallow: /orders$
Disallow: /orders/
Disallow: /profile$
Disallow: /profile/
Disallow: /search$
Disallow: /search/
Disallow: /services$
Disallow: /services/
Disallow: /upload$
Disallow: /upload/
Disallow: /zendesk$
Disallow: /zendesk/
Disallow: /pagegangster$
Disallow: /pagegangster

User-agent: Mediapartners-Google

Disallow: /account$
Disallow: /account/
Disallow: /books/social$
Disallow: /books/social/
Disallow: /download$
Disallow: /download/
Disallow: /errors$
Disallow: /errors/
Disallow: /healthcheck$
Disallow: /healthcheck/
Disallow: /oauth$
Disallow: /oauth/
Disallow: /orders$
Disallow: /orders/
Disallow: /profile$
Disallow: /profile/
Disallow: /search$
Disallow: /search/
Disallow: /services$
Disallow: /services/
Disallow: /upload$
Disallow: /upload/
Disallow: /zendesk$
Disallow: /zendesk/
Disallow: /pagegangster$
Disallow: /pagegangster

User-agent: *

Disallow: /account$
Disallow: /account/
Disallow: /books/social$
Disallow: /books/social/
Disallow: /download$
Disallow: /download/
Disallow: /read$
Disallow: /read/
Disallow: /errors$
Disallow: /errors/
Disallow: /healthcheck$
Disallow: /healthcheck/
Disallow: /oauth$
Disallow: /oauth/
Disallow: /orders$
Disallow: /orders/
Disallow: /profile$
Disallow: /profile/
Disallow: /search$
Disallow: /search/
Disallow: /services$
Disallow: /services/
Disallow: /upload$
Disallow: /upload/
Disallow: /zendesk$
Disallow: /zendesk/
Disallow: /pagegangster$
Disallow: /pagegangster

Sitemap: https://www.calameo.com/sitemaps/incremental
Sitemap: https://www.calameo.com/sitemaps/index
sitemap.xml 200 OK
Type Sitemap Index URLs 212 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
calameo.com — via Gandi SAS, 19 years, 1 months old, hosted on EQUINIX, NL
PASS
calameo.com — via Gandi SAS, 19 years, 1 months old, hosted on EQUINIX, NL
Info::
Domain registered until Jun 28, 2027 (1 years, 2 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: Gandi SAS
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.
Info::
Hosting: EQUINIX, NL
Got: AS15830
Domain expiry

348 days

June 28, 2027

SSL certificate

87 days

Issued by Gandi SAS

Domain age

19 years, 1 months

Registered June 28, 2007

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

EQUINIX, NL

ASN AS15830

85.233.202.179

Registrar

Gandi SAS

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Gandi SAS
Created June 28, 2007 (19 years, 1 months ago)
Expires June 28, 2027 (1 years, 2 months)
Last Updated February 23, 2026
Name Servers ns-1088.awsdns-08.org, ns-1590.awsdns-06.co.uk, ns-192.awsdns-24.com, ns-897.awsdns-48.net
DNSSEC Not enabled
Hosting
IP Address 85.233.202.179
ASN AS15830 (EQUINIX, NL)
Provider EQUINIX, NL
Data source: rdap (1.2s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

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.

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 739 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
105 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
158 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
318 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
740 ms
Total Time Total request time from DNS lookup through full response.
740 ms

Connection waterfall

DNS Lookup 105 ms TCP Connect 158 ms TLS Handshake 318 ms Server Processing 158 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.

Send Feedback