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https://criteo.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
2
PASS
7
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
7 PASS 2 REVIEW
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.criteo.com/
200https://criteo.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

B
TLS Certificate Expiry & Recommendations
30 days until leaf cert expires — 6 issues to address
REVIEW

Certificate validity

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

Recommended actions

  • Renew certificate — 30 days remaining
  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • 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
A+
DNS Records
1 A records, 76 ms lookup
PASS
1 A records, 76 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 23.185.0.4
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2620:12a:8001::4, 2620:12a:8000::4
Info::
2 nameserver(s) configured
Got: ns2.criteo.com, ns1.criteo.com
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: 76 ms
Got: 76 ms
A23.185.0.4
AAAA2620:12a:8001::4, 2620:12a:8000::4
CNAME—
NSns2.criteo.com, ns1.criteo.com
MX
0 criteo-com.o-v1.mx.microsoft
TXT
YBPMr3wnzrvc+cZlAdInTt2+NxXMQGpxQhj5P5iVpVGJCoTxCTAEba1zLY8TgSvA93vp/oALwK62cyqi...
figma-domain-verification=668b818117cc3e8218be1f37394a59fcb46a32641a207ce257ac34...
paloaltonetworks-site-verification=65497271e80658554739787acca314ff6dbc87f555799...
pardot_126241_*=d265aa63cb94a7d4ab978fe7221d8cbb15dde9f1d3e5a456fd19a69bd11e4f10
7SF7wQHg9uqWYFYdcGOLQiiB_W0
amazonses:Mxt5eK0Zqs+o3af4y/rFpm3TUVZYwCtLhGcjP+CBjBA=
dust-domain-verification-217h2t=e0tklsipLjjXFOkAm25fw2v5Y
h1-domain-verification=ZazubeSktBQ7fHE42M1XcPkmV42y8cNGCTyDvpV2ZRAixosa
adobe-idp-site-verification=c92bc085-4e7e-4381-8dcc-01c05839070b
google-site-verification=wcK8K9yjJnvD1C1NSXcc46aDgvAwugzBj4nj8u2sKNw
MS=457D736A0BFC7CAB13851D898563A0B288A53EA7
google-site-verification=3KZ0YjQoJvVBhO2cU8QkXuVjEmZi4A2KvFqPZtobmRw
google-site-verification=fvqjuBWP5_JJq1qemkZ-_6eToSY8ApMdrvrAwXlhJ-A
_ux3a0elq8fy4b05otongd2ucrzt8q4c
jetbrains-domain-verification=7zsqh2tuwsaus8k2x13r45h0j
miro-verification=c4cd4c96ad74b553a8c7e421de468b32ed39a84d
apple-domain-verification=fIY6IPuOxD6C8ZlJ
stripe-verification=9bd0424ff952f9b705a6fc0ef923999595f7456d598c9bf5f7df624d2b8b...
hj-ownership=zcy.vgk7cqu5dfm-VJT
MS=ms50833397
_31h2wnhsxmklt08wsg9vtlk2ef9ssyi
sending_domain1105111=91e5b84fd7f4838b03de08367b10db60d4cc5841908b217ced56a64dd3...
google-site-verification=4YEegovUOux-gwqimo9l1P5Bt62AQw5SHmBji6tn_3g
amazonses:iSsesgLMv3lg5qUs+SHHMDEKRDqtxPrbvqlwDDkXuHE=
docker-verification=a19b3944-c269-414f-bdde-1a76ce8bda61
browserstack-domain-verification=446fbbca-b363-42d2-a26c-ea1234b2bd83
segment-site-verification=UgaCtaJSM8V4aom62Ml5DMW4r52x7uCH
proxy-ssl.webflow.com
docusign=cc56e40b-44cc-4d72-98a3-d6ce0a7ecd21
qlm06ks0mdfvuvhullu5rh5j7d
pardot1105111=ccf76b3a2ba54953b992e9edfbfb01beafb367772d849b6523ceae57aa2c0601
atlassian-domain-verification=lA8T/o8H6e5ri1aMd/RtQaxcaj1gmqC8sTiW0Y9XamzaR5YSKo...
openai-domain-verification=dv-w5hzzMzGhFFvD4xLDvwIWkxp
SPF v=spf1 include:docebosaas.com include:login.mail.criteo.com include:et._spf.pard...
cursor-domain-verification-7jjymp=DaWXV41gTtJM8ITVdVndqHGE9
gdv=2da7edce
status-page-domain-verification=b695v6hc255k
CAALookup not available with standard resolver
Resolved in 76 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), 42 ms total
PASS
1 redirect(s), 42 ms total
Info::
Single redirect
Got: https://criteo.com → https://www.criteo.com/ (301)
Info::
WWW normalization redirect

https://criteo.com

8 ms · HTTP/1.1

301

https://www.criteo.com/

34 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://criteo.com3018 msHTTP/1.1nginx
2https://www.criteo.com/20034 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2620:12a:8001::4, 2620:12a:8000::4
Got: 1 ms connect
IPv6 Ready
AAAA Records 2620:12a:8001::4, 2620:12a:8000::4 Connection Reachable (1 ms)
A+
Crawlability
robots.txt present, sitemap with 9 URLs
PASS
robots.txt present, sitemap with 9 URLs
Info::
robots.txt is present
Got: 1972 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 9 entries
Info::
Sitemap index with 9 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 1972 B Sitemaps referenced 9 User-agents Riddler, Go-http-client, BLEXBot, Node/simplecrawler, dotbot/1.0, Gigabot, magpie-crawler, HTTrack, PetalBot, Zoominfobot, CazoodleBot, WebCopier, Microsoft.URL.Control, Nuclei, WikiDo, Barkrowler, *, MSIECrawler, libwww Blocking No — crawling allowed
User-agent: *

#Dynamic URLs

Disallow: /*?industry=
Disallow: /*?region=
Disallow: /*?business=
Disallow: /*?solution=
Disallow: /*sortby=
Disallow: /*?action=
Disallow: /*?year=

#Paths & URls
# -----------------

Disallow: /privacy/embed/
Disallow: */media_category
Disallow: */email-preference-center/
Disallow: */process/*
Disallow: /wp-json/
Disallow: */criteo2017/fonts/*
Disallow: */privacy/disable-criteo-services-on-internet-browsers/

# Prevents issues with GWT
# -----------------

Allow: /*.css$
Allow: /*.js$

#Trackbacks
# -----------------

Disallow: /trackback
Disallow: /*trackback
Disallow: /*trackback*
Disallow: /*/trackback

#Block feeds for crawlers
# -----------------

Allow: /feed/$
Disallow: /feed/
Disallow: /comments/feed/
Disallow: /*/feed/$
Disallow: /*/feed/rss/$
Disallow: /*/trackback/$
Disallow: /*/*/feed/$
Disallow: /*/*/feed/rss/$
Disallow: /*/*/trackback/$
Disallow: /*/*/*/feed/$
Disallow: /*/*/*/feed/rss/$
Disallow: /*/*/*/trackback/$


# Sitemap
# -----------------

Sitemap: https://www.criteo.com/sitemap_index.xml
Sitemap: https://www.criteo.com/de/sitemap_index.xml
Sitemap: https://www.criteo.com/fr/sitemap_index.xml
Sitemap: https://www.criteo.com/br/sitemap_index.xml
Sitemap: https://www.criteo.com/jp/sitemap_index.xml
Sitemap: https://www.criteo.com/kr/sitemap_index.xml
Sitemap: https://www.criteo.com/es/sitemap_index.xml
Sitemap: https://www.criteo.com/it/sitemap_index.xml
Sitemap: https://www.criteo.com/ru/sitemap_index.xml

# Bots list to exclude
# --------------------------------

User-agent: MSIECrawler
User-agent: WebCopier
User-agent: HTTrack
User-agent: Microsoft.URL.Control
User-agent: libwww
User-agent: Nuclei
User-agent: WikiDo
User-agent: Riddler
User-agent: PetalBot
User-agent: Zoominfobot
User-agent: Go-http-client
User-agent: Node/simplecrawler
User-agent: CazoodleBot
User-agent: dotbot/1.0
User-agent: Gigabot
User-agent: Barkrowler
User-agent: BLEXBot
User-agent: magpie-crawler
Disallow: /
sitemap.xml 200 OK
Type Sitemap Index URLs 9 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
criteo.com — via Gandi SAS, 21 years, 1 months old
PASS
criteo.com — via Gandi SAS, 21 years, 1 months old
Info::
Domain registered until Jun 17, 2035 (9 years, 3 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.
Domain expiry

3262 days

June 17, 2035

SSL certificate

30 days

Issued by Let's Encrypt

Domain age

21 years, 1 months

Registered June 17, 2005

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2620:12a:8001::4

Registrar

Gandi SAS

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the TLS certificate or verify auto-renewal is working
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Gandi SAS
Created June 17, 2005 (21 years, 1 months ago)
Expires June 17, 2035 (9 years, 3 months)
Last Updated August 20, 2025
Name Servers ns1.criteo.com, ns2.criteo.com
DNSSEC Not enabled
Hosting
IP Address 2620:12a:8001::4
Data source: rdap (0.1s)

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 34 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
27 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.
3 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
34 ms
Total Time Total request time from DNS lookup through full response.
34 ms

Connection waterfall

DNS Lookup 27 ms TCP Connect 1 ms TLS Handshake 3 ms Server Processing 4 ms Content Transfer 0 ms
A+
CDN & Delivery
Fastly (HIT, HIT, MISS, MISS)
PASS
Fastly (HIT, HIT, MISS, MISS)
Info::
Site is served via Fastly CDN
Got: x-served-by: cache-chi-klot8100093-CHI, cache-toj-leto2350074-TOJ, cache-toj-leto2350054-TOJ, cache-toj-leto2350054-TOJ
Info::
CDN cache status: HIT, HIT, MISS, MISS
CDN Detected: Fastly
Provider Fastly Cache Status HIT, HIT, MISS, MISS Evidence x-served-by: cache-chi-klot8100093-CHI, cache-toj-leto2350074-TOJ, cache-toj-leto2350054-TOJ, cache-toj-leto2350054-TOJ
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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