Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Madrid, Spain

303 HTTP 303

Checks

4 PASS 4 REVIEW 1 FIX

Redirect Chain

Action

3 redirect(s), 540 ms total

FIX

3 redirect(s), 540 ms total

3 redirects before reaching final URL

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

Uses 302 (temporary) redirect

If permanent, use 301 instead.

Got: https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2F

Redirect overhead: 540 ms total

Got: 540 ms

Cross-domain redirect detected

https://link.springer.com

90 ms · HTTP/1.1

303

https://idp.springer.com/authorize?respo...

108 ms · HTTP/1.1

302

https://idp.springer.com/transit?redirec...

39 ms · HTTP/1.1

302

https://link.springer.com/?error=cookies...

302 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://link.springer.com	303	90 ms	HTTP/1.1	Oscar Platform 0.1651.0
2	https://idp.springer.com/authorize?respo...	302	108 ms	HTTP/1.1
3	https://idp.springer.com/transit?redirec...	302	39 ms	HTTP/1.1
4	https://link.springer.com/?error=cookies...	200	302 ms	HTTP/1.1	Oscar Platform 0.1651.0

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

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

DNS Records

4 A records, 24 ms lookup

REVIEW

4 A records, 24 ms lookup

Resolves to 4 IPv4 address(es)

Got: 151.101.0.95, 151.101.64.95, 151.101.128.95, 151.101.192.95

No IPv6 (AAAA) records

CNAME record at zone apex

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Got: geo-gcp.cdn.springernature.io

No NS records found

No MX records — email not configured via DNS

CAA records not checked

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

No SPF record found in TXT records

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

DNS resolution time: 24 ms

Got: 24 ms

A	151.101.0.95, 151.101.64.95, 151.101.128.95, 151.101.192.95
AAAA	—
CNAME	geo-gcp.cdn.springernature.io
NS	—
MX	—
TXT	—
CAA	Lookup not available with standard resolver

Resolved in 24 ms

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Why this matters

CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.

Learn more ▾

RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.

Source: RFC 1034

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.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

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

Crawlability

Action

robots.txt present, sitemap with 10255 URLs

REVIEW

robots.txt present, sitemap with 10255 URLs

robots.txt is present

Got: 3120 bytes

robots.txt blocks all crawlers

Disallow: / for all user-agents prevents search engines from indexing any page. This will remove the site from search results.

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 10255 entries

Sitemap index with 10255 child sitemaps

robots.txt references sitemap

Disallow: / for all user-agents prevents search engines from indexing any page. This will remove the site from search results.

Why this matters

Disallow: / in robots.txt blocks every search crawler — the site becomes invisible in organic search.

Learn more ▾

Common deployment mistake: a staging robots.txt with `User-agent: * / Disallow: /` ships to prod. The site falls out of search results within days. Verify your robots.txt is the production-intended version. If this is intentional (private site), no action needed.

Source: Google Search Central

robots.txt 200 OK

Size 3120 B Sitemaps referenced 12 User-agents GoogleOther, meta-externalagent, FriendlyCrawler, Mediapartners-Google, Amazonbot, anthropic-ai, Applebot-Extended, img2dataset, omgili, omgilibot, *, CCBot, ClaudeBot, PerplexityBot, YouBot, ImagesiftBot, ChatGPT-User, FacebookBot, cohere-ai, Diffbot, Claude-Web, Bytespider, GPTBot, Google-Extended Blocking Yes — all crawlers blocked

User-agent: *
Disallow: /
Disallow: /chapter/10.1007/978-94-6209-446-8_8
Disallow: /content/pdf/10.1007/978-94-6209-446-8_8.pdf
Allow: /$
Allow: /?$
Allow: /about
Allow: /submission-guidelines
Allow: /brands/
Allow: /partners/
Allow: /track/
Allow: /product/
Allow: /journal*
Allow: /subjects/*
Allow: /subject/*
Allow: /journal/*/collections*
Allow: /collections/*
Allow: /article$
Allow: /article/
Allow: /articles
Allow: /articles/
Allow: /search$
Allow: /series/
Allow: /book*
Allow: /*/book/*
Allow: /chapter/
Allow: /referencework*
Allow: /rwe/
Allow: /protocol/
Allow: /content/
Allow: /counter/pdf/
Allow: /conference/
Allow: /video*
Allow: /doi/
Allow: /*static/
Allow: /sitemap*
Allow: /openurl*
Allow: /shop/
Allow: /10*
Allow: /978*
Allow: /*/*10.1038/scibx*
Allow: /*/*10.1038/sj.jim*
Allow: /*/*10.1038/sj/jim/*
Allow: /platform/recommendations/
Disallow: /*/figures
Disallow: */1000$
Disallow: /*/*/1000$
Disallow: /*/tables
Disallow: /*/schemes
Disallow: /*/structures
Disallow: /*/metrics
Disallow: /*/cover*
Disallow: /*/*/figures
Disallow: /*/*/tables
Disallow: /*/*/schemes
Disallow: /*/*/structures
Disallow: /*/*/metrics
Disallow: /*/*/cover*
Disallow: /content/pdf/bbm*
Disallow: /content/pdf/bfm*
Disallow: /*/*sortBy*
Disallow: /article/*.ris*
Disallow: /*/*/saved-research
Disallow: /*/*/save-research
Disallow: /saved-research
Disallow: /research-questions/*/*
Disallow: /articles/cas-redirect/*

User-agent: Mediapartners-Google
Disallow: /
User-agent: Amazonbot
Disallow: /
User-agent: anthropic-ai
Disallow: /
User-agent: Applebot-Extended
Disallow: /
User-agent: Bytespider
Disallow: /
User-agent: CCBot
Disallow: /
User-agent: ClaudeBot
Disallow: /
User-agent: FacebookBot
Disallow: /
User-agent: GPTBot
Disallow: /
User-agent: Google-Extended
Disallow: /
User-agent: GoogleOther
Disallow: /
User-agent: PerplexityBot
Disallow: /
User-agent: YouBot
Disallow: /
User-agent: meta-externalagent
Disallow: /
User-agent: ImagesiftBot
Disallow: /
User-agent: cohere-ai
Disallow: /
User-agent: Diffbot
Disallow: /
User-agent: FriendlyCrawler
Disallow: /
User-agent: img2dataset
Disallow: /
User-agent: omgili
Disallow: /
User-agent: omgilibot
Disallow: /
User-agent: Claude-Web
Disallow: /
User-agent: ChatGPT-User
Disallow: /

Host: link.springer.com
Sitemap: https://link.springer.com/sitemap-index.xml
Sitemap: https://link.springer.com/sitemap-collections.xml
Sitemap: https://link.springer.com/sitemap-subjects-index.xml
Sitemap: https://link.springer.com/sitemap-springer-journals.xml
Sitemap: https://link.springer.com/sitemap-bmc-springeropen-journals.xml
Sitemap: https://link.springer.com/sitemap-palgrave-journals.xml
Sitemap: https://link.springer.com/sitemap-entries/sitemap_brands.xml
Sitemap: https://link.springer.com/sitemap-entries/sitemap_shops.txt
Sitemap: https://link.springer.com/sitemap-entries/snl-top10k-embo-articles.xml
Sitemap: https://link.springer.com/sitemap-entries/sitemap_book_series.xml
Sitemap: https://link.springer.com/sitemap-entries/snl-top10k-so-articles-10-2025.xml
Sitemap: https://link.springer.com/sitemap-entries/snl-top10k-bmc-articles-10-2025.xml

sitemap.xml 200 OK

Type Sitemap Index URLs 10255 entries Valid XML Yes

Child Sitemaps:

TLS Certificate Expiry & Recommendations

55 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

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+

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

PASS

www/non-www, trailing slash, HTTP→HTTPS

www/non-www redirect configured correctly (preferred: non-www)

HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.link.springer.com/

200https://link.springer.com/

Preferred variant: non-www

HTTP → HTTPS

301http://link.springer.com/ → https://link.springer.com/

Consistent

Domain Intelligence

springer.com — via EuroDNS S.A., 29 years, 3 months old, hosted on Fastly

PASS

springer.com — via EuroDNS S.A., 29 years, 3 months old, hosted on Fastly

Domain expires in 36 days

Consider enabling auto-renewal to prevent accidental expiration.

Got: Expires May 28, 2026

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.

Registrar: EuroDNS S.A.

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.

Hosting: Fastly

Got: AS54113

Domain expiry

EXPIRED

May 28, 2026

SSL certificate

55 days

Issued by Let's Encrypt

Domain age

29 years, 3 months

Registered May 29, 1997

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Fastly

ASN AS54113

151.101.120.95

Registrar

EuroDNS S.A.

Unlocked 6 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 EuroDNS S.A.

Created May 29, 1997 (29 years, 3 months ago)

Expires May 28, 2026 (1 months)

Last Updated May 22, 2025

Name Servers pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk

DNSSEC Not enabled

Hosting

IP Address 151.101.120.95

ASN AS54113 (FASTLY - Fastly, Inc., US)

Provider Fastly

Data source: rdap (0.3s)

Consider enabling auto-renewal to prevent accidental expiration.

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

A+

HTTP Probe Timing

Total 141 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

46 ms

TCP Connect

1 ms

TLS Handshake

4 ms

Time to First Byte

141 ms

Total Time

141 ms

Connection waterfall

DNS Lookup 46 ms TCP Connect 1 ms TLS Handshake 4 ms Server Processing 90 ms Content Transfer 0 ms

CDN & Delivery

Fastly (MISS, MISS, MISS)

PASS

Fastly (MISS, MISS, MISS)

Site is served via Fastly CDN

Got: x-served-by: cache-toj-leto2350066-TOJ, cache-toj-leto2350023-TOJ

CDN cache status: MISS, MISS, MISS

CDN Detected: Fastly

Provider Fastly Cache Status MISS, MISS, MISS Evidence x-served-by: cache-toj-leto2350066-TOJ, cache-toj-leto2350023-TOJ

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.