Skip to content
https://sennheiser.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
89
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 PASS 4 REVIEW
B
Redirect Chain
2 redirect(s), 397 ms total
REVIEW
2 redirect(s), 397 ms total
Warning::
2 redirects before reaching final URL
Each redirect adds latency. Try to minimize the chain to 1 hop.
Info::
WWW normalization redirect

https://sennheiser.com

24 ms · HTTP/1.1

301

https://www.sennheiser.com/

151 ms · HTTP/1.1

307

https://www.sennheiser.com/en-de

222 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://sennheiser.com30124 msHTTP/1.1cloudflare
2https://www.sennheiser.com/307151 msHTTP/1.1cloudflare
3https://www.sennheiser.com/en-de200222 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

Each redirect adds latency. Try to minimize the chain to 1 hop.

Why this matters

Redirect chain — each hop adds latency; combine into one redirect where possible.

Source: Google Search Central / web.dev

B
Domain Intelligence
sennheiser.com — via COREhub, S.R.L., 30 years, 5 months old
REVIEW
sennheiser.com — via COREhub, S.R.L., 30 years, 5 months old
Critical::
Domain expires in 2 days
This domain expires on April 25, 2026. Domains that expire accidentally cause complete website downtime. Enable auto-renewal or renew manually now.
Got: Expires Apr 25, 2026
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: COREhub, S.R.L.
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

EXPIRED

April 25, 2026

SSL certificate

88 days

Issued by Google Trust Services

Domain age

30 years, 5 months

Registered April 24, 1996

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2a00:1c50:94::2

Registrar

COREhub, S.R.L.

Unlocked 5 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Domain has EXPIRED — renew immediately to avoid total site outage
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar COREhub, S.R.L.
Created April 24, 1996 (30 years, 5 months ago)
Expires April 25, 2026 (2 days)
Last Updated April 26, 2025
Name Servers ns1.lemarit.de, ns1.lemarit.net, ns2.lemarit.de, ns2.lemarit.net, ns3.lemarit.de
DNSSEC Not enabled
Hosting
IP Address 2a00:1c50:94::2
Data source: rdap (0.1s)

This domain expires on April 25, 2026. Domains that expire accidentally cause complete website downtime. Enable auto-renewal or renew manually now.

Why this matters

Domain expiry approaching — renew immediately and ensure auto-renew + alerting are configured.

Source: ICANN renewal policy

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

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

Certificate validity

88
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: MAD)
Got: cf-ray: 9f078505bdb6baa2-MAD
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9f078505bdb6baa2-MAD
A+
DNS Records
1 A records, 93 ms lookup
PASS
1 A records, 93 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 217.114.94.2
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: 2a00:1c50:94::2
Info::
5 nameserver(s) configured
Got: ns2.lemarit.net, ns1.lemarit.net, ns3.lemarit.de, ns2.lemarit.de, ns1.lemarit.de
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: 93 ms
Got: 93 ms
A217.114.94.2
AAAA2a00:1c50:94::2
CNAME—
NSns2.lemarit.net, ns1.lemarit.net, ns3.lemarit.de, ns2.lemarit.de, ns1.lemarit.de
MX
10 sennheiser-com.mail.protection.outlook.com
TXT
q332e6l50vm1h0ga9tvlsthid1
mentimeter-77f2df6d-98bd-419f-8c21-7ed993ebe126
mandrill_verify.gokxzvGg1O2L57mnOHNiOQ
sennheiser-protech.azurewebsites.net
SPF v=spf1 ip4:52.35.123.36 ip4:208.75.123.0/24 ip4:160.34.204.28 ip4:210.247.232.21...
google-site-verification=-Sg167eCGJ75wsMFq2xlONUHvwZ4iI9Sy8oEnIjFClM
ZluOUzs1r15HRLSaNgUEl8aXwFFO4GcmBUFFh6QQ7IWvc6iO45YBJC6Ojb8AA9DtxEB1sn9LaFYv5ZqM...
atlassian-domain-verification=aVHMJUZofa64QSo/b5SWlUVasvkglgaEKn3YADCEeTia6zoovj...
DFE57EEB9DBEF92F39F0111564FE10D0DCA1F2AF1F8F8F63933914B89E364B90
asv=a4fc18b51c816b058da104964ad95fbb
jetbrains-domain-verification=4m4oeto0hgp289rker21tvo7g
google-site-verification=_aD_EFyr0p1mWv1zC50gR_4OelEN_Ep99yTWcOrNZhc
MS=ms41694223
apple-domain-verification=4EfC07p7jJyuUcmL
facebook-domain-verification=giia1wn199kztdv0no9u91og0jtn1h
parallels-domain-verification=bab498b4edd9488e88ec7f2f8e37915ec6d79c597bd04827a7...
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

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+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2a00:1c50:94::2
Got: 1 ms connect
IPv6 Ready
AAAA Records 2a00:1c50:94::2 Connection Reachable (1 ms)
A+
Crawlability
robots.txt present, sitemap with 148 URLs
PASS
robots.txt present, sitemap with 148 URLs
Info::
robots.txt is present
Got: 133 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 148 entries
Info::
Sitemap index with 148 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 133 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: /episerver/
Disallow: /utils/
Disallow: /*?searchTerm=

Sitemap: https://www.sennheiser.com/sitemapindex.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 148 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.sennheiser.com/
200https://sennheiser.com/

HTTP → HTTPS

301http://sennheiser.com/ → https://www.sennheiser.com/

Consistent

A+
HTTP Probe Timing
Total 60 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
38 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
8 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
60 ms
Total Time Total request time from DNS lookup through full response.
61 ms

Connection waterfall

DNS Lookup 38 ms TCP Connect 1 ms TLS Handshake 8 ms Server Processing 14 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