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https://synthesia.io

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from New York, United Stated
301 Moved Permanently
Checks
9
5 PASS 4 REVIEW
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
URL Variants
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
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.synthesia.io/
200https://synthesia.io/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://synthesia.io/ → https://synthesia.io/

Consistent

B
TLS Certificate Expiry & Recommendations
56 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

56
days left
0d 30d 60d 90d+

Recommended actions

  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • 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 (BYPASS)
REVIEW
Cloudflare (BYPASS)
Info::
Site is served via Cloudflare CDN (edge: EWR)
Got: cf-ray: 9f07cbf60a119cc1-EWR
Info::
CDN cache status: BYPASS
CDN Detected: Cloudflare
Provider Cloudflare Cache Status BYPASS Evidence cf-ray: 9f07cbf60a119cc1-EWR
A+
DNS Records
1 A records, 18 ms lookup
PASS
1 A records, 18 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 198.202.211.1
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-1028.awsdns-00.org, ns-1821.awsdns-35.co.uk, ns-186.awsdns-23.com, ns-652.awsdns-17.net
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
Info::
DNS resolution time: 18 ms
Got: 18 ms
A198.202.211.1
AAAA—
CNAME—
NSns-1028.awsdns-00.org, ns-1821.awsdns-35.co.uk, ns-186.awsdns-23.com, ns-652.awsdns-17.net
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 alt4.aspmx.l.google.com
10 alt3.aspmx.l.google.com
TXT
1password-site-verification=JD7KERT3Y5HNXKD6FXB7YKRZGM
MS=ms74732329
Sendinblue-code:29658eaaaea6ffca5919604d7d36fb5e
ZOOM_verify_Tju3v8sGubnGQJoUUY2x4m
_stackone-sso-verification-token-synthesia-sso=Et9E9xri8wCC0YSzkpIsJDIU9EIycJo5
adobe-idp-site-verification=4cbc5bb424c97993b26e764a20f4a2ee3e7285f0d7230519b2a5...
anthropic-domain-verification-20v6a7=aqBQrTQlginl4kMoz8Svwkiu9
apple-domain-verification=8I3k3yqGMSlOrh5o
astro-domain-verification=cmamk6war2c6i01m0td6x8h6d
asv=808802b3d5cbe561f8688554562e1aa2
atlassian-domain-verification=mGaeBKVHih3vnIXZqIeZgKeDMxM8B3TL45kQOBRnaUtLqf4qmx...
atlassian-sending-domain-verification=e92aef7c-5360-4362-a59a-3f3689331a68
canva-site-verification=po76qAizv8aVT8UgySxsEg
cursor-domain-verification-rv18zb=KvBCEfYWOv0n4hymtZxyqCjCq
docker-verification=db217b69-fc3c-4c54-aa9c-322580bd91bd
es-domain-verification=f840030c-82b3-4916-a580-6948383170ac
google-site-verification=2TqYpU6DztI2l6QmS9fba2g7ZTwJ3hCU8ms6yAnWOOI
google-site-verification=TeQtsNCxuYsUVmuvx--24ZTrAizAh2L58bmP8nd2IuE
google-site-verification=g-qsTxnCoNjoI4qe0XiKoZTUm-RXDkENTM85yotVbL8
google-site-verification=oZyPsJhO6ZW67qHgQX2u5meXkMEbvxMYIfomX4lWp40
h1-domain-verification=8EK2SDHiz6uaXjqygT86e4dD6MHYEBSt8HDE7HEkxWsNvyfb
hubspot-domain-verification=NWYyNzNjYjAtMDdmMi00YTlhLThhNTUtNmRjYmJkMzI4MjI5
jamf-site-verification=eq5oMfWyUULLZtA5le9YYQ
jetbrains-domain-verification=8lwcki3tuaqgle7v0tftm62au
launchdarkly-domain-verification=6e9ed02b-d5dd-48fd-9ab2-7eb5d208220e
linear-domain-verification=2e4rdfgqc9w8
live-kit-domain-verification-p95a0w=dDkturAhxvCQvnaaCNw5zdQdR
make-domain-verification=62a6dc8a-e9fd-4f53-998c-3ca2d6a5f8aa
miro-verification=e750dbac1d1d928643a89d3dcb912f48b4c52e98
mongodb-site-verification=iVSCsMvSWcNB7nCpmXQcGRCnWg3PEa4R
notion-domain-verification=OdyUjawMDThTxB8cCutIN5LTAWbcTdOTAs1e9tfTqzD
openai-domain-verification=dv-ODcjUCTjEdskTaopsuIzSwNn
openai-domain-verification=dv-gMGmKYu4DR3N1XXWuwfnI87O
parsec-domain-verification=td_2galiXNwtcaocRLXiLQaCtipugH
postman-domain-verification=14025ac6fc540587c8810cb57184eb7a3f0302f20804f1a0bcb8...
rex-domain-verification-r06c8p=hLhObFjkJTGsTqc4QunO67MTI
rex-domain-verification-wbfdew=oeZH9x8NvC1FF7bHbhT5WfUpt
slack-domain-verification=Apnz25IVT7B1fcwdqxcdTwVEmPrV8OGhh84ih2MX
stripe-verification=7c1e84e14ccf11a2185957e4c6bb685b20a06a1d81cdd796726d7cdff87e...
stripe-verification=84044d00cdc4f7600dcd1595d121302e1f7f3f0cefa57df8069cd9ecb417...
uber-domain-verification=df5fa1c2-8f21-4bfa-aa0d-a75b4861c645
unblocked-domain-verification=EY02pQsiN5qShgZJUOxxJA==
SPF v=spf1 include:_spf.google.com include:spf.mandrillapp.com include:amazonses.com...
wiz-domain-verification=92b1d1f92bb44ed96c02c880c676852371b2d8de072bc5469fb489cb...
CAALookup not available with standard resolver
Resolved in 18 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), 147 ms total
PASS
1 redirect(s), 147 ms total
Info::
Single redirect
Got: https://synthesia.io → https://www.synthesia.io/ (301)
Info::
WWW normalization redirect

https://synthesia.io

100 ms · HTTP/1.1

301

https://www.synthesia.io/

47 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://synthesia.io301100 msHTTP/1.1cloudflare
2https://www.synthesia.io/20047 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 906 URLs
PASS
robots.txt present, sitemap with 906 URLs
Info::
robots.txt is present
Got: 69 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 906 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 69 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /

Sitemap: https://www.synthesia.io/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 906 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
synthesia.io — via NameCheap, Inc., 9 years, 1 months old, hosted on Cloudflare
PASS
synthesia.io — via NameCheap, Inc., 9 years, 1 months old, hosted on Cloudflare
Info::
Domain registered until Apr 20, 2027 (1 years remaining)
Info::
Registrar: NameCheap, Inc.
Info::
Registrar lock is enabled
Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.
Info::
Hosting: Cloudflare
Got: AS209242
Domain expiry

309 days

April 20, 2027

SSL certificate

56 days

Issued by Google Trust Services

Domain age

9 years, 1 months

Registered April 20, 2017

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Cloudflare

ASN AS209242

198.202.211.1

Registrar

NameCheap, Inc.

Locked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar NameCheap, Inc.
Created April 20, 2017 (9 years, 1 months ago)
Expires April 20, 2027 (1 years)
Last Updated March 14, 2024
Name Servers ns-1821.awsdns-35.co.uk, ns-1028.awsdns-00.org, ns-652.awsdns-17.net, ns-186.awsdns-23.com
Registrant Privacy service provided by Withheld for Privacy ehf
Hosting
IP Address 198.202.211.1
ASN AS209242 (CLOUDFLARESPECTRUM Cloudflare, Inc., US)
Provider Cloudflare
Data source: whois (0.9s)

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 115 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
5 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
2 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.
115 ms
Total Time Total request time from DNS lookup through full response.
116 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 2 ms TLS Handshake 8 ms Server Processing 101 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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