Skip to content
https://habr.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
2
PASS
6
INFO
0
Probed from Madrid, Spain
302 Found
Checks
9
6 PASS 2 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.

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

B
TLS Certificate Expiry & Recommendations
262 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

262
days left
0d 30d 60d 90d+

Recommended actions

  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
1 A records, 131 ms lookup
PASS
1 A records, 131 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 178.248.237.68
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
3 nameserver(s) configured
Got: ns3.habradns.net, ns1.habradns.net, ns2.habradns.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: 131 ms
Got: 131 ms
A178.248.237.68
AAAA—
CNAME—
NSns3.habradns.net, ns1.habradns.net, ns2.habradns.net
MX
10 mxs.habramail.net
TXT
google-site-verification=XFULBM_wEq97-MNl8j--Pb07rVk_fy7e981d_6AEMjg
yandex-verification: e86d27babf23ffa3
google-site-verification=-Lxx4RPV5xdNSkQo1PaDGlxZyQqohbnj08iYh1E53Kk
SPF v=spf1 include:spf.habramail.net include:_spf.dashasender.ru ~all
CAALookup not available with standard resolver
Resolved in 131 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
Redirect Chain
1 redirect(s), 594 ms total
PASS
1 redirect(s), 594 ms total
Info::
Single redirect
Got: https://habr.com → https://habr.com/ru/feed/ (302)
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://habr.com
Info::
Redirect overhead: 594 ms total
Got: 594 ms

https://habr.com

133 ms · HTTP/1.1

302

https://habr.com/ru/feed/

461 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://habr.com302133 msHTTP/1.1QRATOR
2https://habr.com/ru/feed/200461 msHTTP/1.1QRATOR

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

A+
Crawlability
robots.txt present, sitemap with 22 URLs
PASS
robots.txt present, sitemap with 22 URLs
Info::
robots.txt is present
Got: 1624 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 22 entries
Info::
Sitemap index with 22 child sitemaps
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 1624 B Sitemaps referenced 0 User-agents Googlebot, Slurp, *, Yandex Blocking No — crawling allowed
User-agent: Yandex
Disallow: /search/
Disallow: /ru/search/
Disallow: /en/search/
Disallow: /ru/companies/*/fans/
Disallow: /en/companies/*/fans/
Disallow: /ru/companies/*/workers/
Disallow: /en/companies/*/workers/
Disallow: /ru/users/*/followers/
Disallow: /en/users/*/followers/
Disallow: /ru/users/*/following/
Disallow: /en/users/*/following/
Clean-param: utm_source&utm_medium&utm_term&utm_campaign /

User-agent: Googlebot
Disallow: /search/
Disallow: /ru/search/
Disallow: /en/search/
Disallow: /*?*utm_source=
Disallow: /*?*utm_medium=
Disallow: /*?*utm_term=
Disallow: /*?*utm_campaign=
Disallow: /ru/companies/*/fans/
Disallow: /en/companies/*/fans/
Disallow: /ru/companies/*/workers/
Disallow: /en/companies/*/workers/
Disallow: /ru/users/*/followers/
Disallow: /en/users/*/followers/
Disallow: /ru/users/*/following/
Disallow: /en/users/*/following/

User-agent: Slurp
Crawl-delay: 8
Disallow: /search/
Disallow: /ru/search/
Disallow: /en/search/
Disallow: /*?*utm_
Disallow: /ru/companies/*/fans/
Disallow: /en/companies/*/fans/
Disallow: /ru/companies/*/workers/
Disallow: /en/companies/*/workers/
Disallow: /ru/users/*/followers/
Disallow: /en/users/*/followers/
Disallow: /ru/users/*/following/
Disallow: /en/users/*/following/

User-agent: *
Crawl-delay: 10
Disallow: /search/
Disallow: /ru/search/
Disallow: /en/search/
Disallow: /*?*utm_
Disallow: /ru/companies/*/fans/
Disallow: /en/companies/*/fans/
Disallow: /ru/companies/*/workers/
Disallow: /en/companies/*/workers/
Disallow: /ru/users/*/followers/
Disallow: /en/users/*/followers/
Disallow: /ru/users/*/following/
Disallow: /en/users/*/following/
sitemap.xml 200 OK
Type Sitemap Index URLs 22 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::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.habr.com/
200https://habr.com/

Preferred variant: non-www

HTTP → HTTPS

301http://habr.com/ → https://habr.com/

Consistent

A+
Domain Intelligence
habr.com — via Internet Domain Service BS Corp, 23 years, 5 months old, hosted on HLL-AS, RU
PASS
habr.com — via Internet Domain Service BS Corp, 23 years, 5 months old, hosted on HLL-AS, RU
Info::
Domain registered until Mar 11, 2028 (1 years, 10 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: Internet Domain Service BS Corp
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: HLL-AS, RU
Got: AS51115
Domain expiry

604 days

March 11, 2028

SSL certificate

262 days

Issued by Sectigo Limited

Domain age

23 years, 5 months

Registered March 11, 2003

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

HLL-AS, RU

ASN AS51115

178.248.237.68

Registrar

Internet Domain Service BS Corp

Unlocked 3 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 Internet Domain Service BS Corp
Created March 11, 2003 (23 years, 5 months ago)
Expires March 11, 2028 (1 years, 10 months)
Last Updated November 25, 2025
Name Servers ns1.habradns.net, ns2.habradns.net, ns3.habradns.net
DNSSEC Enabled
Hosting
IP Address 178.248.237.68
ASN AS51115 (HLL-AS, RU)
Provider HLL-AS, RU
Data source: rdap (0.3s)

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

Connection waterfall

DNS Lookup 18 ms TCP Connect 29 ms TLS Handshake 33 ms Server Processing 117 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